Question
Find the following values without a calculator.

  1. 1 - 211 = _____
  2. 55 - 15 = _____
  3. 911 - 111 = _____
3 m
(a)

Click button first when a symbol is required. X

(b)

Click button first when a symbol is required. X

(c)

Click button first when a symbol is required. X

Find the following values without a calculator.

  1. 1 - 211 = _____
  2. 55 - 15 = _____
  3. 911 - 111 = _____