Question

Verify and mention the property used:

a) 20 X [(-19)+5]=[20 X(-19)+20 X5]

b) [(-60) X(-40)] X12=(-60) X[(-40)X 12]​

Answer 1

Answer:

a) distributive property

$20 \times ( - 19 + 5) = ( (- 19 \times 20 )+(5 \times 20))$

$20 \times ( - 14) = ( - 380 + 100)$

$- 280 = - 280$

b) associative property

$(2400) \times 12 = - 60 \times ( - 480)$

$28800 = 28800$