(b) 638 x 176 - 638 x 75 - 638 by using distributive property
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638 × 176 - 638 × 75 - 638
= 638 ( 176 - 75 ) - 638
[ By distributive property ]
a × b + a × c = a ( b + c )
= 638 × 101 - 638 × 1
= 638 ( 101 - 1 )
= 638 × 100
= 63800
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