NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals

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Written by Team Trustudies
Updated at 2021-05-07


NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.1

Q.1 Solve
i) 2?35
ii) 4+78
iii) 35+27
iv) 911?415
v) 710+25+32
vi) 223+312
vii) 812?358



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 2?35=2×5?35=75=125
ii) 4+78=8×4+78=398=478
iii) 35+27=7×3+5×235=21+1035=3135
iv) 911?415=15×9?11×4165=135?44165=91165
v) 710+25+32=7×1+2×2+3×510=7+4+1510=2610=26÷210÷2=135=235
vi) 223+312=83+72=2×8+3×76=16+216=376=616
vii) 812?358=172?298=17×4?29×18=68?298=398=478

Q.2 Arrange the following in descending order: (i)29,23,821
(ii) 15,37,710



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i)29,23,821
LCM of 9, 3 ,21 = 63 then
29=2×79×7=1463 23=2×213×21=4263 821=8×321×3=2463 Hence 4263>2463>1463
23>821>29

(ii) 15,37,710
LCM of 5,7,10 = 70 then
15=1×145×14=1470 37=3×107×10=2170 710=7×710×7=4970 Hence 4970>2170>1470
710>37>15

Q.3 In a “magic square” the sum of number in each row, in each column and along the diagonals is the same. Is this a magic square?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Along first row = 411+911+211=1511
Along second row = 311+511+711=1511
Along third row = 811+111+611=1511
Along first column= 411+311+811=1511
Along second column= 911+511+111=1511
Along third column= 211+711+611=1511
Along first diagonal= 411+511+611=1511
Along second diagonal= 211+511+811=1511
Since, the sum of all the fraction row wise, column wise and the diagonal wise is same i.e. 1511. Hence, it is a magic square.

Q.4 A rectangular sheet of paper is 1212 cm long and 1023cm wide. Find its perimeter.



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Length of sheet = 1212=252
Breath of sheet =1023=323
Perimeter = 2× (length +breath)
=2×[252+323]
= 2×75+646=2×1396=1393=4313

Q.5 Find the perimeter of (i) triangle ABE (ii) the rectangle BCDE in this figure. Whose perimeter is greater?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) Perimeter of triangleABE = AB+BE+AE = 52+234+335=52+114+185=50+55+7220=17720=81720
(ii) perimeter of BCDE = 2 ×( length +breath)
= 2×[234+76]=2×[114+76]=2×33+1412=2×4712=476=756
Since 81720>756
Thus perimeter of ?ABE is greater than the perimeter of the rectangle BCDE.

Q.6 Salil wants to put a picture in a frame. The picture is 735cm wide. To fit in the frame, the picture cannot be more than 7310 cm wide. How much should the picture be trimmed?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

From the question, it is given that,
Picture having a width of =735=38/5cm
Frame having a width of 7310=73/10cm
The picture should be trimmed by = [(38/5) – (73/10)]
= 76?7310cm = 310cm
Hence, the required width to be trimmed =3/10 cm.

Q.7 Ritu ate =35part of an apple and the remaining apple was eaten by her brother Somu. How much part of the apple did Somu eat? Who had the larger share? By how much?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Let the whole apple be 1.
part of apple eaten by Ritu=3/5
Therefore part of apple eaten by her brother Somu
=1 - 3/5 = 5?35 = 2/5
Since 3/5 >2/5 thus the share of Ritu was larger.
Difference =3/5-2/5 =1/5 part.

Q.8 Michael finished colouring a picture in 7/12 hour. Vaibhav finished colouring the same picture in 3/4 hour. Who worked longer? By what fraction was it longer?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Time taken by Michael = 7/12 hour
Time taken by Vaibhav = 3/4 hour
Multiply by 3 on both nominator and denominator There fore 3/4 hour =912 hour
Therefore 9/12>7/12
Hence time taken by Vaibhav was longer .
Difference = 3/4 - 7/12 = 9/12-7/12 = 2/12=1/6 hour longer

NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.2

Q.1 Which of the drawings (a) to (d) show:
(i) 2 × (1/5) (ii) 2 × (1/2) (iii) 3 × (2/3) (iv) 3 × (1/4)



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 2×(1/5) represents drawing (d)
(ii) 2×(1/2) represents drawing (b)
(iii) 3×(2/3) represents drawing (a)
(iv) 3×(1/4) represents drawing (c)

Q.2 Some pictures (a) to (c) are given below. Tell which of them show:

(i) 3 × (1/5) = (3/5)
(ii) 2 × (1/3) = (2/3)
(iii) 3 × (3/4) = 214



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 3×(1/5)= (3/5) represents figure (c)
(ii) 2×(1/3)=(2/3) represents figure (a)
(iii) 3×(3/4)=214 represents figure (b)

Q.3 Multiply and reduce to lowest form and convert into a mixed fraction:

(i) 7×(3/5)
(ii) 4× (1/3)
(iii) 2×(6/7)
(iv) 5× (2/9)
(v) (2/3) × 4
(vi) (5/2) ×6
(vii) 11× (4/7)
(viii) 20×(4/5)
(ix) 13×(1/3)
( x) 15 ×(3 /5)



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i)7×(3/5) = 21/5 = 415
(ii) 4× (1/3) = 4/3 = 113
(iii) 2×(6/7) =12/7 =157
(iv) 5× (2/9) = 10/9 = 119
(v) (2/3) × 4 = 8/3 =223
(vi) (5/2) ×6 = 30/2 =30÷22÷2=15/1=15
(vii) 11× (4/7) = 44/7 =627
(viii) 20×(4/5) = (20/1) × (4/5)= (80/5)= 16
(ix) 13×(1/3) = 13/3 = 413
(x) 15 ×(3 /5) = 45 /5 = 15

Q.4 Shade:
(i) 1/2 of the circles in box (a)
(ii) 2/3 of the circles in box (b)
(iii) 3/5 of the circles in box (c)



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 1/2 × 12 = 12/2 =6 circles

(ii) 2/3 × 9 = 18/3 = 6 triangles
(iii) 3/5 × 15 =45/5 =9 squares

Q.6 Multiply and express as a mixed fraction.
(a) 3×515
(b) 5×634
(c) 7×214
(d) 4×613
(e) 314× 6
(f) 325 × 8



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(a) 3×515=3×26/5=78/5=1535
(b) 5×634=5×27/4=135/4=3334
(c) 7×214=7×9/4=63/4=1534
(d) 4×613=4×19/3=76/3=2513
(e) 314×6=13/4×6=78/4=39/2=1912
(f) 325×8=17/5×8=136/5=2715

Q.5 Find:
(a) 1/2 of (i) 24 (ii) 46
(b) 2/3 of (i) 18 (ii) 27
(c) 3/4 of (i) 16 (ii) 36
(d) 4/5 of (i) 20 (ii) 35



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(a) (i) 24
We have, = 1/2 × 24 = 24/2 = 12
(ii) 46
We have, = 1/2× 46 =23
(b) (i) 18
We have,= 2/3 × 18 = 2 × 6 = 12
(ii) 27
We have, = 2/3 × 27= 2 × 9 =18
(c) (i) 16
We have,= 3/4 × 16= 3 × 4= 12
(ii) 36
We have= 3/4 × 36= 3 × 9= 27
(d) (i) 20
We have,= 4/5 × 20 = 4 × 4 = 16
(ii) 35
We have, = 4/5 × 35 = 4 × 7 = 28

Q.7 find :
(a) 1/2 of (i) 234(ii)429
(b) 5/8 of (i) 356(ii)923



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(a)(i) 1/2×234=1/2×11/4=11/8=138
(ii) 1/2×429=1/2×38/9=38/18=19/9=219
(b) (i) 5/8×56=5/8×23/6=115/48=21948
(ii) 58×923=5/8×29/3=145/24=6124

Q.8 Vidya and Pratap went for a picnic. Their mother gave them a water bottle that contained 5 liters water. Vidya consumed 2/5 of the water. Pratap consumed the remaining water.
(i) How much water did Vidya drink?
(ii) What fraction of the total quantity of water did Pratap drink?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) Water consumed by Vidya = 2/5 of 5 litres
2/5×5=10/5=2litre
Water consumed by Patap = 5 litres – 2 litres
= 3 litres
(ii) Fraction of water consumed by Pratap = 3/5 litres

NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.3

Q.1 Find:
(i) 1/4 of (a) 1/4 (b) 3/5 (c) 4/3
(ii) 1/7 of (a) 2/9 (b) 6/5 (c) 3/10



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) (a) 1/4×1/4=1/8
(b) 1/4×3/5=3/20
(c) 1/4×4/3=4/12=1/3
(ii) (a) 1/7× 2/9=2/63
(b) 1/7× 6/5 = 6/35
(c) 1/7 × 3/10 = 3/70

Q.2 Multiply and reduce to lowest form (if possible):
(i) 2/3× 2/frac23
(ii) 2/7×7/9
(iii) 3/8× 6/4
(iv) 9/5×3/5
(v) 1/3×15/8
(vi)11/2 × 3/10
(vi) 4/5× 12/7



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 2/3×8/3=(2×8)/(3×3)=16/9= 179
(ii) 2/7×7/9=14/63=14÷763÷7=2/9
(iii) 3/8×6/4 = 18/32 =18÷232÷2=9/16
(iv) 9/5×3/5=27/25=1225
(v)1/3×15/8=15/24=15÷324÷3=5/8
(vi) 11/2×3/10=33/20=11320
(vii) 4/5×12/7 = 48/35=11335

Q.3 Multiply the following fractions:
(i) (2/5) × 514
(ii) 625 ×7/9
(iii) 3/2× 513
(iv) 5/6×237
(v) 325 ×4/7
(vi) 235× 3
(vii)347 × 3/5



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 2/5×21/4=42/20= 42÷220÷2= 21/10
=2110
(ii) 32/5×7/9=224/45= 44445
(iii) 3/2 ×16/3 =48/6=8
(iv) 5/6×17/7=85/42= 2142
(v) 17/5×4/7=68/35= 13335
(vi)13/5×3=39/5= 745
(vii) 25/7×3/5 ÷75/35=75÷535÷5=15/7=217

Q.4 Which is greater:
(i) (2/7) of (3/4) or (3/5) of (5/8)
(ii) (1/2) of (6/7) or (2/3) of (3/7)



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 2/7×3/4=6/28= 6÷228÷2=3/14
3/5×5/8=15/40=15÷540÷5=3/8
Numerator are same and 14 >8
Hence 3/8>3/14
(ii) 1/2×6/7=6/14=6÷214÷2=3/7
2/3×3/7=6/21=6÷321÷3=2/7
Hence 3/7>2/7

Q.5 Saili plants 4 saplings, in a row, in her garden. The distance between two adjacent saplings is 3/4 m. Find the distance between the first and the last sapling.



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

The distance between two adjacent saplings =3/4 m
Number of saplings planted by Saili in a row = 4
Then, number of gap in saplings = 3/4 × 4=12/4=3
Therefore The distance between the first and the last saplings = 3 × 3/4= (9/4) m = 214

Q.6 Lipika reads a book for 134hours everyday. She reads the entire book in 6 days. How many hours in all were required by her to read the book?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

In 1 day Lipika needs 134 hours
In 6 days Lipika will need 6×134hours=6×7/4
42/4=21/2hours = 1012 hours

Q.7 A car runs 16 km using 1 litre of petrol. How much distance will it cover using 234 litres of petrol.



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

In 1 litre of petrol, the car covers 16 km distance In 234 litres of petrol
the car will cover 234 × 16 km distance=11/4×16=44 km

Q.8 (a) (i) provide the number in the box [ ], such that (2/3) × [ ] = (10/30)
(ii) The simplest form of the number obtained in [ ] is
(b) (i) provide the number in the box [ ], such that (3/5) × [ ] = (24/75)
(ii) The simplest form of the number obtained in [ ] is



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.4

Q.1 Find:
(i) 12 ÷ 3/4
(ii) 14 ÷ (5/6)
(iii) 8 ÷ (7/3)
(iv) 4 ÷ (8/3)
(v) 3 ÷ 213
(vi) 5÷ 347



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) We have,
= 12 × reciprocal of 3/4
= 12 × (4/3)= 4 × 4= 16 (ii) We have,
= 14 × reciprocal of (5/6)
= 14 × (6/5)= 84/5 =1645
(iii) We have,
= 8 × reciprocal of (7/3)
= 8 × (3/7)= (24/7) = 337
(iv) We have,
= 4 × reciprocal of (8/3)
= 4 × (3/8)= 1 × (3/2)= 3/2 =112
(v)we have,
3÷7/3= 3× reciprocal of 7/3 =3×3/7=9/7=127
(vi)we have,
5÷25/7=5×reciprocal of 25/7 =5×7/25 = 7/5 =125

Q.2 Find the reciprocal of each of the following fractions. Classify the reciprocals as proper fractions, improper fractions and whole numbers.
(i) 3/7 (ii) 5/8 (iii) 9/7 (iv) 6/5 (v) 12/7
(vi) 1/8 (vii) 1/11



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) Reciprocal of 3/7 = 7/3 (ii) Reciprocal of 5/8=8/5 (iii) Reciprocal of 9/7=7/9 (iv) Reciprocal of 6/5=5/6 (v) Reciprocal of 12/7=7/12 (vi) Reciprocal of 1/8=8 (vii) Reciprocal of 1/11=11

Q.3 Find:
(i) 7/3 ÷2 (ii) 4/9÷5 (iii) 6/13 ÷7
(iv) 413÷3 (v) 312÷4 (vi) 437÷7



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) We have,
= (7/3) × reciprocal of 2= (7/3) × (1/2)= 7/6= 116
(ii) We have,
= (4/9) × reciprocal of 5= (4/9) × (1/5)= 4/45 (iii) we have ,
= (6/13) × reciprocal of 7= (6/13) × (1/7)= 6/91
(iv) we have,
=(13/3) × reciprocal of 3= (13/3) × (1/3)= 13/9= 149
(v) we have ,
= (7/2) × reciprocal of 4= (7/2) × (1/4)= 7/8 (vi) we have,
= (31/7) × reciprocal of 7=(31/7) ×(1/7)= 31/49

Q.5 Find:
(i) (2/5) ÷ (1/2)
(ii) (4/9) ÷ (2/3)
(iii) (3/7) ÷ (8/7)
(iv) 213÷3/5
(v) 312÷8/3
(vi) 2/5 ÷112
(vii) 315÷123
(viii)215÷115



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) We have,
= (2/5) × reciprocal of 1/2= (2/5) × (2/1)= 4/5
(ii) We have,
= (4/9) × reciprocal of (2/3)= (4/9) × (3/2)=12/18= 2/3
(iii) We have,
= (3/7) × reciprocal of (8/7)= (3/7) × (7/8)=21/56= 3/8
(iv) 213=7/3
= (7/3) × reciprocal of (3/5)= (7/3) × (5/3)= 35/9
(v) 312 =7/2
= (7/2) × reciprocal of (8/3)= (7/2) × (3/8)= 21/16
(vi) 2/5 ÷112=(2/5) × reciprocal of (3/2)
= (2/5) × (2/3)= 4/15
(vii) 315÷123= (16/5) × reciprocal of (5/3)
= (16/5) × (3/5)= 48/25
(viii)215÷115= (11/5) × reciprocal of (6/5)
= (11/5) × (5/6)= 11/6 = 156.

NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.5

Q.1 Which is greater?
(i) 0.5 or 0.05
(ii) 0.7 or 0.5
(iii) 7 or 0.7
(iv) 1.37 or 1.49
(v) 2.03 or 2.30
(vi) 0.8 or 0.88



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 0.5 or 0.05
Comparing the tenths place, we get 5 > 0
Therefore 0.5 > 0.05
(ii) 0.7 or 0.5 Comparing the tenths place, we get 7 > 5 Therefore 0.7 > 0.5
(iii) 7 or 0.7 Comparing the one’s place, we get 7 > 0 Therefore 7 > 0.7
(iv) 1.37 or 1.49
Comparing the tenths place, we get 3 < 4
Therefore 1.37 < 1.49 or 1.49 > 1.37
(v) 2.03 or 2.30
Comparing the tenths place, we get 0 < 3br> Therefore 2.03 < 2.30 or 2.30 > 2.03
(vi)0.8 or 0.88 ? 0.80 or 0.88
Since tenths place is same.
Comparing the hundredth place, we get 0 < 8
Therefore .80 < 0.88 or 0.88 > 0.80

Q.2 Express as rupees using decimals:
(i) 7 paise
(ii) 7 rupees 7 paise
(iii) 77 rupees 77 paise
(iv) 50 paise
(v) 235 paise



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i)7 paise =7/100 rupees = 0.07 rupees
(ii) 7 rupees 7 paise = 7 rupees + 7/100 rupees = 7.07 rupees
(iii) 77 rupees 77 paise = 77 rupees + 77/100 rupees = 77.77 rupees
(iv) 50 paise = 50/100 rupees = 0.50 rupees
(v) 235 paise = 235/100 rupees = 2.35 rupees

Q.3 (i) Express 5 cm in metre and kilometre.
(ii) Express 35 mm in cm, m and km.



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 1 metre = 100 cm
1 kilometre = 1000 metre = 100 × 1000 cm = 100000 cm
Therefore 5 cm = 5/100 metre = 0.05 metre
5 cm = 5/100000 km = 0.00005 km
Hence, 5 cm = 0.05 m and 0.00005 km

(ii) 1 cm = 10 mm and 1 km = 100000 cm
Therefore 35 mm = 35/10 cm = 3.5 cm,
35 mm = 35/1000 m = 0.035 m
35 mm = 35/1000000 km = 0.000035 km
Hence, 35 mm = 3.5 cm, 0.035 m and 0.000035 km.

Q.4 Express in kg:
(i) 200 g
(ii) 3470 g
(iii) 4 kg 8 g



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 200g = 200/1000 kg [since 1 kg = 1000g] = 0.2 kg
(ii) 3470 g = 3470/10000 = 3.47 kg [since 1 kg = 1000 g] (iii) 4 kg 8 g = 4 kg + 8/10000kg [since 1 kg = 1000 g] = 4 kg + 0.008 kg = 4.008 kg

Q.5 Write the following decimal numbers in the expanded form:
(i) 20.03
(ii) 2.03
(iii) 200.03
(iv) 2.034



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 20.03 = 2 × 10 + 0 × 1 + 0 × 1/10 + 3 × 1/100
(ii) 2.03 = 2 × 1 + 0 × 1/10 + 3 × 1/100
(iii) 200.03 = 2 × 100 + 0 × 10 + 0 × 1 + 0 × 1/10 +3 × 1/100
(iv) 2.034 = 2 × 1 + 0 × 1/10 + 3 × 1/10 + 4 × 1/1000

Q.6 Write the place value of 2 in the following decimal numbers:
(i) 2.56
(ii) 21.37
(iii) 10.25
(iv) 9.42
(v) 63.352



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) Place value of 2 in 2.56 = 2 × 1 = 2 i.e. ones
(ii) Place value of 2 in 21.37 = 2 × 10 = 20 i.e. tens
(iii) Place value of 2 in 10.25 = 2/10 = 0.2 i.e. tenths
(iv) Place value of 2 in 9.42 = 2/100 = 0.02 i.e. hundredths
(v) Place value of 2 in 63.352 = 2/1000 = 0.002 i.e. thousandths.

Q.7 Dinesh went from place A to place B and from there to place C. A is 7.5 km from B and B is 12.7 km from C. Ayub went from place A to place D and from there to place C. D is 9.3 km from A and C is 11.8 km from D. Who travelled more and by how much?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :


Distance travelled by Dinesh from A to C
= AB + BC = 7.5 km +- 12.7 km= 20.2 km
Distance travelled by Ayub from A to C
= AD + DC = 9.3 km + 11.8 km = 21.1 km
Since 21.1 km > 20.2 km.
Hence, Ayub travelled more distance.

Q.8 Shyama bought 5 kg 300 g apples and 3 kg 250 g mangoes. Sarala bought 4 kg 800 g oranges and 4 kg 150 g bananas. Who bought more fruits?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Fruits bought by Shyama
= 5 kg 300 g apples + 3 kg 250 g mangoes
= 5.300 kg apples + 3.250 kg mangoes
= 8.550 kg of fruits
Fruits bought by Sarala
= 4 kg 800 g oranges +- 4 kg 150 g bananas
= 4.800 kg oranges + 4.150 kg bananas
= 8.950 kg of fruits
Since 8.950 kg > 8.550 kg
Hence, Sarala bought more fruits.

Q.9 How much less is 28 km than 42.6 km?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Since 28 km < 42.6 km
42.6 km - 28.0 km = 14.6 km
Hence, 28 km is less than 42.6 km by 14.6 km.

NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.6

Q.1 Find:
(i) 0.2 × 6
(ii) 8 × 4.6
(iii) 2.71 × 5
(iv) 20.1 × 4
(v) 0.05 × 7
(vi) 211.02 × 4
(vii) 2 × 0.86



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 0.2 × 6
?2 × 6 = 12 and we have 1 digit right to the decimal point in 0.2.
Thus 0.2 × 6 = 1.2
(ii) 8×4.6= 36.8
(iii) 2.71× 5 = 13.55
(iv) 20.1 ×4 = 80.4
(v) 0.05 × 7 = 0.35
(vi) 211.02 × 4 = 844.05
(vi) 2 × 0.86 = 1.72

Q.2 Find the area of rectangle whose length is 5.7 cm and breadth is 3 cm.



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Length = 5.7 cm
Breadth = 3 cm
Area of rectangle = length × breadth
= 5.7 × 3 = 17.1 cm²
Hence, the required area =17.1 cm²

Q.3 Find:
(i) 1.3 × 10
(ii) 36.8 × 10
(iii) 153.7 × 10
(iv) 168.07 × 10
(v) 31.1 × 100
(vi) 156.1 × 100
(vii) 3.62 × 100
(viii) 43.07 × 100
(ix) 0.5 × 10
(x) 0.08 × 10
(xi) 0.9 × 100
(xii) 0.03 × 1000



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 1.3 × 10 = 13/10 ×10 =13
(ii) 36.8 ×10 = 368/10×10= 368
(iii) 153.7 × 10 = 1537/10 ×10 = 1537
(iv) 168.07×10 = 16807/100 ×10= 16807/10 = 1680.7
(v) 31.1×100 = 311/10×100= 311×10 =3110
(vi) 156.1×100 = 1561/10×100= 1561×10 =15610
(vii) 3.62 × 100 = 362/100×100 = 362
(viii) 43.07×100 = 4307/100×100= 4307
(ix) 0.5×10 = 5/10×10= 5
(x) 0.08× 10 = 8/100 ×10= 8/10 = 0.8
(xi) 0.9 × 100 = 9/10×100= 9×10=90
(xii) 0.03 × 1000 =3/100×1000 =3/10= 0.3

Q.4 A two-wheeler covers a distance of 55.3 km in one litre of petrol. How much distance will it cover is 10 litres of petrol?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

Distance covered in 1 litre = 55.3 km
Distance covered in 10 litres = 55.3 × 10 km= 553/10×10=553
Hence, the required distance = 553 km

Q.5 Find:
(i) 2.5 ×0.3
(ii) 0.1 × 51.7
(iii) 0.2 × 316.8
(iv) 1.3 × 3.1
(v) 0.5 × 0.05
(vi) 11.2 × 0.15
(vii) 1.07 × 0.02
(viii) 10.05 × 1.05
(ix) 100.01 × 1.1
(x) 100.01 × 1.1



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 0 2.5 × 0.3
?25 × 3 = 75 and there are 2 digits (1 + 1) right to the decimal points in 2.5 and 0.3.
Thus 2.5 × 0.3 = 0.75
(ii) 0.1 × 51.7
? 1 × 517 = 517 and there are two digits (1 + 1) right to the decimal places in 0.1 and 51.7.
(iii) 0.2 × 316.8
? 2 × 3168 = 6336 and there are 2 digits (1 + 1) right to the decimal points in 0.2 and 316.8.
Thus 0.2 × 316.8 = 63.36.

(iv) 1.3 × 3.1
? 13 × 31 = 403 and there are 2 digits (1 + 1) right to the decimal points in 1.3 and 3.1.
Thus 1.3 × 3.1 – 4.03
(v) 0.5 × 0.05
? 5 × 5 = 25 and there are 3 digits (1 + 2) right to the decimal points in 0.5 and 0.05.
Thus 0.5 × 0.05 = 0.025
(vi) 11.2 × 0.15
? 112 × 15 = 1680 and there are 3 digits (1 + 2) right to the decimal points in 11.2 and 0.15.
Thus 11.2 × 0.15 = 1.680

(vii) 1.07 × 0.02
? 107 × 2 = 214 and there are 4-digits (2 + 2) right to the decimal places is 1.07 × 0.02.
Thus 1.07 × 0.02 = 0.0214
(viii) 10.05 × 1.05
? 1005 × 105 = 105525 and there are 4 digits (2 + 2) right to the decimal places in 10.05 × 1.05.
Thus 10.05 × 1.05 = 10.5525
(ix) 101.01 × 0.01
? 10101 × 1 = 10101 and there are 4 digits (2 + 2) right to the decimal places in 101.01 and 0.01.
Thus 101.01 × 0.01 = 1.0101
(x) 100.01 × 1.1
? 10001 × 11 = 110011 and there are 3 digits (2 + 1) right to the decimal points in 100.01 and 1.1.
Thus 100.01 × 1.1 = 110.011.

NCERT solutions for class 7 Maths Chapter 2 Fractions And Decimals Exercise 2.7

Q.1 Find:
(i) 0.4 ÷ 2
(ii) 0.35 ÷ 5
(iii) 2.48 ÷ 4
(iv) 65.4 ÷ 6
(v) 651.2 ÷ 4
(vi) 14.49 ÷ 7
(vii) 3.96 ÷ 4
(viii) 0.80 ÷ 5



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 0.4 ÷ 2= 4/10÷2 = 4/10× 1/2 = 2/10= 0.2
(ii) 0.35 ÷ 5 = 35/100 ÷ 5 = 35/100×1/5 = 7/100 = 0.07
(iii) 2.48 ÷ 4 = 248/100÷4=248/100×1/4 =62/100=0.62
(iv) 65.4 ÷ 6 = 654/10÷6=654/10×1/6=109/10=10.9
(v) 651.2÷4 = 6512/10÷ 4 =6512/10×1/4= 1628/10=162.8
(vi) 14.49÷7= 1449/100÷7=1449/100×1/7=207/100=2.07
(vii) 3.96÷4 = 396/100÷4=396/100×1/4=99/100=0.99
(viii) 0.80÷5=80/100÷5=80/100×1/5=16/100=0.16

Q.2 Find:
(i) 4.8 ÷ 10
(ii) 52.5 ÷ 10
(iii) 0.7 ÷ 10
(iv) 33.1 ÷ 10
(v) 272.23 ÷ 10
(vi) 0.56 ÷ 10
(vii) 3.97 ÷10



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 4.8 ÷ 10 = 0.48 (Shifting the decimal point to the left by 1 place)
(ii) 52.5 ÷ 10 = 5.25 (Shifting the decimal point to the left by 1 place)
(iii) 0.7 ÷ 10 = 0.07 (Shifting the decimal point to the left by 1 place)
(iv) 33.1 ÷ 10 = 3.31 (Shifting the decimal point to the left by 1 place)
(v) 272.23 ÷ 10 = 27.223 (Shifting the decimal point to the left by 1 place)
(vi) 0.56 4- 10 = 0.056(Shifting the decimal point to the left by 1 place)
(vii) 3.97 ÷ 10 = 0.397(Shifting the decimal point to the left by 1 place)

Q.3 Find:
(i) 2.7 ÷ 100
(ii) 0.3 ÷ 100
(iii) 0.78 ÷ 100
(iv) 432.6 ÷ 100
(v) 23.6 ÷ 100
(vi) 98.53 ÷ 100



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 2.7 ÷ 100 = 0.027(Shifting the decimal point to the left by 2 places)
(ii) 0.3 ÷ 100 = 0.003(Shifting the decimal point to the left by 2 places)
(iii) 0.78 ÷ 100 = 0.0078 (Shifting the decimal point to the left by 2 places)
(iv) 432.6 ÷ 100 = 4.326 (Shifting the decimal point to the left by 2 places)
(v) 23.6 ÷ 100 = 0.236 (Shifting the decimal point to the left by 2 places)
(vi) 98.53 ÷ 100 = 0.9853 (Shifting the decimal point to the left by 2 places)

Q.4 Find:
(i) 7.9 ÷ 1000
(ii) 26.3 ÷ 1000
(iii) 38.53 ÷ 1000
(iv) 128.9 ÷ 1000
(v) 0.5 ÷ 1000



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 7.9 ÷ 1000 = 0.0079 (Shifting the decimal point to the left by 3 places)
(ii) 26.3 ÷ 1000 = 0.0263 (Shifting the decimal point to the left by 3 places)
(iii) 38.53 ÷ 1000 = 0.03853 (Shifting the decimal point to the left by 3 places)
(iv) 128.9 ÷ 1000 = 0.1289 (Shifting the decimal point to the left by 3 places)
(v) 0.5 ÷ 1000 = 0.0005 (Shifting the decimal point to the left by 3 places)

Q.5 Find:
(i) 7 ÷ 3.5
(ii) 36 ÷ 0 .2
(iii) 3.25 ÷ 0.5
(iv) 30.94 ÷ 0.7
(v) 0.5 ÷ 0.25
(vi) 7.75 ÷ 0.25
(vii) 76.5 ÷ 0.15
(viii) 37.8 ÷ 1.4
(ix) 2.73 ÷ 1.3



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

(i) 7 ÷ 3.5 = 73.5=7035=2
(ii) 36÷0.2 = 360.2=3602=180
(iii) 3.25÷0.5 = 3.250.5=325×105×100=6510=6.5
(iv) 30.94÷0.7= 30.940.7=3094×107×100=44210=44.2
(v) 0.5÷0.25= 0.50.25=5×10025×10=500250=2 (vi)7.75÷0.25=7.750.25=77525=31
(vii) 76.5÷0.15= 76.50.15=765×10015×10=5101=510
(viii) 37.8 ÷1.4= 37.81.4=37814=27
(ix) 2.73 ÷1.3 = 2.731.3=273×1013×100=2110=2.1

Q.6 A vehicle covers a distance of 43.2 km in 2.4 litres of Petrol. How much distance will it cover in one litre of petrol?



NCERT Solutions for Class 7 Maths Chapter 2 Fractions And Decimals


Answer :

2.4 litres of petrol is required to cover 43.2 km distance
Therefore litre of petrol will be required to cover 43.2
43.22.4=43224=18km



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