Addition and subtraction – balance equations – up to 100

Learn with an example

👉 Which number makes the equation true?

32 + ____  = 81 − 13

  • First, subtract 81 − 13:
  • 32 + ? = 81 − 13
  • 32 + ? = 68
  • Decide which number makes the addition number sentence true. You can subtract to find the answer.
  • Subtract: 68 − 32 = 36
  • The missing number is 36.

👉 Which number makes the equation true?

64 − _____  = 7 + 7

  • First, add 7 + 7:
  • 64 − ? = 7 + 7
  • 64 − ? = 14
  • Subtract 14 from both sides:
  • 64 − ? − 14 = 14 − 14
  • 50 − ? = 0
  • Now, find the number that goes in the blank space. Remember, when a number is subtracted from itself, the difference is zero. The number in the blank space must be 50.
  • The missing number is 50.

👉 Which number makes the equation true?

99 − 87 =____  + 8

  • First, subtract 99 − 87:
  • 99 − 87 = ? + 8
  • 12 = ? + 8
  • Decide which number makes the addition number sentence true. You can think of an addition fact you know, or you can subtract to find the answer.
  • The addition fact is: 4 + 8 = 12
  • Did you remember this addition fact? If not, you can find the answer by subtracting.
  • Subtract: 12 − 8 = 4
  • The missing number is 4.

Let’s practice!🖊️