(a) We have 738 x 103
= 738 x (100 + 3)
= 738 x 100 + 738 x 3
[By distributive property of multiplication over addition]
= 73800 + 2214
= 76014
(b) 1005 x 168 = (1000 + 5) x 168
= 168 x (1000 + 5) (By commutative property)
= (168 x 1000) + (168 x 5)
= 1,68,000 + 840
= 1,68,840
