1.

Find the product using suitable properties.i) 205 × 1989 ii) 1991 × 1005

Answer»

i) 205 × 1989 = (200 + 5) × 1989 (Distributive property of multiplication over addition) 

= (200 × 1989) + (5 × 1989) 

= 397800 + 9945 

= 407745

ii) 1991 × 1005

= 1991 × (1000 + 5) 

Distributive property of multiplication over addition. 

= (1991 × 1000)+ (1991 × 5) 

= 1991000 + 9955 

= 2000955



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