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(a) 4, 8 and 12

(b) 5, 15 and 25

Answer :

(a) 4, 8 and 12

Factors of 4 = 1, 2, 4

Factors of 8 = 1, 2, 4, 8

Factors of 12 = 1, 2, 3, 4, 6, 12

Hence, the common factors are 1, 2 and 4.
(b) 5, 15 and 25

Factors of 5 = 1, 5

Factors of 15 = 1, 3, 5, 15

Factors of 25 = 1, 5, 25

Hence, the common factors are 1 and 5.

- Q.1 Find the common factors of: (a) 20 and 28 (b) 15 and 25 (c) 35 and 50 (d) 56 and 120
- Q.3 Find first three common multiples of: (a) 6 and 8 (b) 12 and 18
- Q.4 Write all the numbers less than 100 which are common multiples of 3 and 4.
- 5. Which of the following numbers are co-prime? (a) 18 and 35 (b) 15 and 37 (c) 30 and 415 (d) 17 and 68 (e) 216 and 215 (f) 81 and 16
- Q.6. A number is divisible by both 5 and 12. By which other number will that number be always divisible?
- Q.7. A number is divisible by 12. By what other numbers will that number be divisible?

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- NCERT solutions for class 6 maths chapter 2 Whole Numbers
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- NCERT solutions for class 6 maths chapter 12 Ratio and Proportion
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