a) 645 x ( 30 - 6 )
= 645 x 24
= 15 480
278 x ( 50 - 9 )
= 278 x 41
= 11 398
b) 137 x 13 - 137 x 3
= 137 x ( 13 - 3 )
= 137 x 10
= 1370
538 x 12 - 538 x 2
= 538 x ( 12 - 2 )
= 538 x 10
= 5380
a)645x(30-6)=645x24=15480
278x(50-9)=278x41=11398
b)137x13-137x3=137x(13-3)=137x10=1370
538x12-538x2=538x(12-2)=538x10=5380
a) 645 x (30-6) = 645 x 24
=15480
278x(50-9)= 278x41
=11398
b)137x13-137x3= 137x(13-3)
=137x10 =1370
538x12-538x2 =538x(12-2)
=538x10=5380