Question

Fill in the blanks :

(i) 8 – 0 = ……….. and 0 – 8 = ……….

8 – 0 ≠ 0 – 8, this shows subtraction of whole numbers is not ………..

(ii) 5 – 10 = ………., which is not a …………

=> Subtraction of ……….. is not closed.

(iii) 7 – 18 = ……….. and (7 – 18) – 5 = …………..

18 – 5 = …………. and (7 – 18) – 5 = ………….

Is (7 – 18) – 5 = 7 – (18 – 5)?

=> Subtraction of whose numbers is not ………….

Answer 1

(i) 8 – 0 = 8 and 0 – 8 = -8

8 – 0 & 0 – 8, this shows subtraction of whole numbers is not commutative

(ii) 5 – 10 = -5, which is not a whole number

=> Subtraction of whole numbers is not associative.

(iii) 7 – 18 = -11 and (7 – 18) – 5 = -16

18 – 5 = 13 and (7 – 18) – 5 = -6

Is (7 – 18) – 5 = 7 – (18 – 5) =?

No, (7- 18) – 5 ≠ 7 – (18 – 5)

=> Subtraction of whole number is not associative.