Question
Find the following values without a calculator.

  1. 14 + _____ = 34
  2. 12 + _____ = 39
  3. 73 + _____ = 99
  4. 77 + _____ = 168
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. 14 + _____ = 34
  2. 12 + _____ = 39
  3. 73 + _____ = 99
  4. 77 + _____ = 168