Question
Find the following values without a calculator.

  1. 18 + _____ = 39
  2. 6 + _____ = 41
  3. 53 + _____ = 61
  4. 88 + _____ = 95
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. 18 + _____ = 39
  2. 6 + _____ = 41
  3. 53 + _____ = 61
  4. 88 + _____ = 95