Question
Find the following values without a calculator.
  1. 90 - 6 = _____
  2. 100 - 67 = _____
  3. 30 - 20 = _____
  4. 800 - 33 = _____
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 - 6 = _____
  2. 100 - 67 = _____
  3. 30 - 20 = _____
  4. 800 - 33 = _____