Chapter 1 . Rational Numbers

Exercise 1.1

1. Using appropriate properties find.
(i)

-23×35+52-35×16

(ii)

25×-37-16×32+114×25

Solution : (i) We have,

-23×35+52-35×16

=-23×35-35×16+52

=-3523+16+52

=-352×2+16+52

=-35×4+16+52

=-35×56+52

=-36+52

=-3×1+5×36

=-3+156

=126=2

(ii) We have,

25×-37-16×32+114×25

=25×-37+114×25-16×32

=25×-37+114-16×32

=25×-3×2+114-16×32

=25×-6+114-16×32

=25×-514-16×32

=15×-57-12×12

=-17-14

=-4-77×4

=-1128