Question
Find the following values without a calculator.
  1. 90 - 4 = _____
  2. 200 - 57 = _____
  3. 60 - 30 = _____
  4. 700 - 80 = _____
1 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

(d)

Click button first when a symbol is required. X

Find the following values without a calculator.
  1. 90 - 4 = _____
  2. 200 - 57 = _____
  3. 60 - 30 = _____
  4. 700 - 80 = _____