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(a) z + 1, z – 1, y + 17, y – 17

(b) 17y, \(\frac{y}{17} \) , 5z

(c) 2y + 17, 2y – 17

(d) 7m, -7m + 3, -7m – 3

Answer :

(a) z + 1 \(\rightarrow \) Addition, z ? 1 \(\rightarrow \) Subtraction

y + 17 \(\rightarrow \) Addition , y ? 17 \(\rightarrow \) Subtraction

(b) 17 y \(\rightarrow \) Multiplication

\(\frac{y}{17} \) \(\rightarrow \) Division

5z \(\rightarrow \) Multiplication

(c) 2y +17 \(\rightarrow \) Multiplication and Addition

2y ? 17 \(\rightarrow \) Multiplication and Subtraction

(d) 7m \(\rightarrow \) Multiplication

?7m + m \(\rightarrow \) Multiplication and Addition

?7m? 3 \(\rightarrow \) Multiplication and Subtraction

- Q.1 Make up as many expressions with numbers (no variables) as you can from three numbers 5, 7 and 8. Every number should be used not more than once. Use only addition, subtraction and multiplication.
- Q.2 Which out of the following are expressions with numbers only? (a) y + 3 (b) (7 × 20) – 8z (c) 5 (21 – 7) + 7 × 2 (d) 5 (e) 3x (f) 5 – 5n (g) (7 × 20) – (5 × 10) – 45 + p
- Q.4 Give expressions for the following cases. (a) 7 added to p (b) 7 subtracted from p (c) p multiplied by 7 (d) p divided by 7 (e) 7 subtracted from –m (f) –p multiplied by 5 (g) –p divided by 5 (h) p multiplied by -5
- Q.5 Give expressions in the following cases. (a) 11 added to 2m (b) 11 subtracted from 2m (c) 5 times y to which 3 is added (d) 5 times y from which 3 is subtracted (e) y is multiplied by -8 (f) y is multiplied by -8 and then 5 is added to the result (g) y is multiplied by 5 and the result is subtracted from 16 (h) y is multiplied by -5 and the result is added to 16.
- Q.6 (a) Form expressions using t and 4. Use not more than one number operation. Every expression must have t in it. (b) Form expressions using y, 2 and 7. Every expression must have y in it. Use only two number operations. These should be different.

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