Question

How can you use 1100 divided by 11 to help you find 1089 divided by 11

Answer 1

1,100 ÷ 11 = 100

1,089 ÷ 11 = (1,100 - 11) ÷ 11

= (1,100 ÷ 11) - (11 ÷ 11)

= 100 - 1 = 99