Question
Find the following values without a calculator.

  1. 8 + 7 + 4 = _____
  2. 2 + _____ + 5 = 12
  3. 18 - 4 - 7 = ______
  4. _____ - 3 - 9 = 7
4 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. 8 + 7 + 4 = _____
  2. 2 + _____ + 5 = 12
  3. 18 - 4 - 7 = ______
  4. _____ - 3 - 9 = 7