Question
Find the following values without a calculator.
  1. 20 - 7 = _____
  2. 600 - 34 = _____
  3. 60 - 20 = _____
  4. 900 - 48 = _____
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. 20 - 7 = _____
  2. 600 - 34 = _____
  3. 60 - 20 = _____
  4. 900 - 48 = _____