Question

Each of the small shaded squares inside the

rectangle below has an area of 9 cm².
What area of the rectangle is unshaded?
Give your answer in cm².
Not actual size

Answer 1

180 cm²

Explanation:

Each shaded square has area 9 cm².

The outer rectangle is 6 by 7 small squares.

Total area corresponds to 6 × 7 = 42 small squares.

22 squares are shaded.

42 - 22 = 20

20 small squares are unshaded.

20 × 9 cm² = 180 cm²