Q.1
Which number is missing: 10 + ? = 100
  • 100
  • 9
  • 90
  • 10
Q.2
Which three pairs of numbers all add up to 100?
  • 20 + 80 10 + 90 50 + 50
  • 10 + 80 20 + 18 60 + 4
  • 12 + 18 20 + 8 100 + 10
  • 40 + 6 50 + 5 10 + 9
Q.3
Which one of the following number pairs do not add up to give 100?
  • 100 + 0
  • 90 + 10
  • 60 + 40
  • 20 + 18
Q.4
If you know that 2 + 8 = 10, what else do you know?
  • 20 + 80 = 100
  • 12 + 18 = 20
  • 2 + 80 = 100
  • 8 + 20 = 100
Q.5
Which of these three other facts go with 30 + 70 = 100?
  • 100 + 30 = 70 70 - 30 = 100 30 - 70 = 100
  • 30 + 30 = 70 70 - 30 = 100 30 - 100 = 70
  • 70 + 70 = 100 30 +30 = 100 100 - 100 = 30
  • 70 + 30 = 100 100 - 30 = 70 100 - 70 = 30
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