Question

10. Using suitable property, find the value of: a) 54279 × 92 + 8 × 54279 b) 485 × 5× 784 + 97 × 25 × 216

Answer 1

$a) \: 54279 \times 92 + 8 \times 54279 \\ = 54279(92 + 8) \\ = 54279(100) \\ = 5427900$
$b) \: 485 \times 5 \times 784 + 97 \times 25 \times 216 \\ = ( 500 - 15) \times 5 \times 784 + (100 - 3) \times 25 \times 216 \\ = ( 2500 - 75) \times 784 + (2500 - 75) \times 216 \\ = ( 2425) \times 784 +( 2425) \times 216 \\ 2425(784 + 216) \\ = 2425(1000) \\ = 2425000$

Answer 2

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