Question

Solve $2\times (81\times 5)$ using suitable properties of whole numbers.

• A. 810
• B. 180
• C. 360
• D. 540

Answer 1

The correct option is A 810

$2\times (81\times 5)$
Using commutativity
= $2\times (5\times 81)$
Using associativity
= $(2\times 5)\times 81$
= $10\times 81$
= $810$