a) 64 x 72 + 28 x 64
= 64 x ( 72 + 28 )
= 64 x 100
= 6400
b) 98 x 101 - 98
= 98 x 101 - 98 x 1
= 98 x ( 101 - 1 )
= 98 x 100
= 9800
a) 64 x 72 + 28 x 64
= 64 x (72 + 28)
= 64 x 100
= 6400
b) 98 x 101 - 98
= 98 x (101 - 1)
= 98 x 100
= 9800
64 x 72 + 28 x 64 98 x 101 - 98
= 64 x ( 72 + 28 ) = 9898 - 98
= 64 x 100 = 9800
= 6400
a) = 64 x ( 72 + 28)= 64 x 100 = 6400
b) = 98 x ( 101-1)= 98 x 100= 9800
64 x 72 + 28 x 64 98 x 101 - 98
= 64 x ( 72 + 28 ) = 9898 - 98
= 64 x 100 = 9800
= 6400