Question

Find (-49)×18;(-25)×(-31);70×(-19)+(-1)×70 using distributive property.please answer this question with method.

Answer 1

1)
$( - 49) \times 18 \\ = ( - 50 + 1) \times 18 \\ = - 50 \times 18 + 1 \times 18 \\ = - 900 + 18 \\ = - 882 \: \: \: \: \: answer \\ 2)( - 25) \times ( - 31) \\ = ( - 25) \times ( - 30 - 1) \\ = ( - 25) \times ( - 30) + ( - 25) \times ( - 1) \\ = 750 + 25 \\ = 775 \: \: \: \: \: answer \\ 3) \: 70 \times ( - 19) + ( - 1) \times 70 \\ = 70 \times ( - 20 + 1) + ( - 1) \times 70 \\ = 70 \times ( - 20) + (70 \times 1) + ( - 1) \times 70\\ = - 1400 + 70 - 70 \\ = - 1330 - 70 \\ = - 1400$