Q.1
Which of the following is true?
  • 12 - 20 = 8
  • 20 - 2 = 18
  • 8 + 20 = 12
  • 18 + 20 = 2
Q.2
Which number is missing: 17 + ? = 20
  • 5
  • 3
  • 7
  • 9
Q.3
Which 'family' of facts is incorrect?
  • 7 + 13 = 20 13 + 7 = 20 20 - 13 = 7 20 - 7 = 13
  • 8 + 12 = 20 12 + 8 = 20 20 - 8 = 12 20 - 12 = 8
  • 9 + 11 = 20 11 + 9 = 20 20 - 11 = 9 20 - 9 = 11
  • 4 + 14 = 20 14 + 4 = 20 20 - 4 = 14 20 - 14 = 4
Q.4
Which of the following is true?
  • 2 + 18 = 20 so 20 + 18 = 2
  • 2 + 18 = 20 so 18 + 2 = 20
  • 2 + 18 = 20 so 20 + 2 = 18
  • 2 + 18 = 20 so 18 + 20 = 2
Q.5
Which number fact is incorrect?
  • 11 + 9 = 20
  • 9 + 11 = 20
  • 20 - 9 = 11
  • 11 - 20 = 9
Q.6
Which 'family' of facts is incorrect?
  • 2 + 18 = 20 18 + 2 = 20 20 - 18 = 2 20 - 2 = 18
  • 16 + 5 = 20 5 + 16 = 20 20 - 16 = 5 20 - 5 = 16
  • 5 + 15 = 20 15 + 5 = 20 20 - 5 = 15 20 - 15 = 5
  • 10 + 10 = 20 20 - 10 = 10
Q.7
Which of the following pairs of number do not add up to give 20?
  • 9 + 11
  • 2 + 18
  • 16 + 5
  • 20 + 0
Q.8
Which three other facts go with 16 + 4 = 20?
  • 20 + 16 = 4 20 + 4 = 16 16 - 20 = 4
  • 16 - 20 = 4 4 - 20 = 16 20 + 16 = 4
  • 4 + 16 = 20 16 - 4 = 20 4 - 16 = 20
  • 4 + 16 = 20 20 - 16 = 4 20 - 4 = 16
Q.9
Which three pairs of numbers all add up to 20?
  • 19 + 1 17 + 3 5 + 15
  • 12 + 9 11 + 7 3 + 16
  • 7 + 20 6 + 12 7 + 19
  • 4 + 12 16 + 8 20 + 1
Q.10
If you know that 14 + 6 = 20, what else do you know?
  • 20 + 14 = 6
  • 20 - 14 = 6
  • 14 - 20 = 6
  • 6 - 14 = 20
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