Question

A)158×432+158×68-158×400= B)2300×28-28×2299-28= C)1245×200+100×1245-1245-290=
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Answer 1

A)

158 × 432 + 158 × 68 - 158 × 400 =

158 × ( 432 + 68 - 400 ) =

158 × ( 500 - 400 ) =

158 × 100 = 15800

B)

2300 × 28 - 28 × 2299 - 28 =

28 × ( 2300 - 2299 ) - 28 =

28 × 1 - 28 =

28 - 28 = 0

C)

1245 × 200 + 100 × 1245 - 1245 - 290 =

1245 × ( 200 + 100 ) - 1245 - 290 =

1245 × 300 - 1245 - 290 =

373500 - 1245 - 290 =

372255 - 290 = 371965