Question

The area of a playing card is 63 square centimeters. The perimeter is 32 centimeters. What are the dimensions of the playing card?

Answer 1

7 cm by 9 cm

Explanation:

The sum of the dimensions is half the perimeter, so is 16 cm. This means you're looking for factors of 63 that have a sum of 16.

Your knowledge of times tables helps you remember that 63 = 7×9. As it happens, those factors have a sum of 16.

The playing card is 7 cm by 9 cm.