What is a number bond to 20?
  • Numbers which are on a number line
  • A strong number less than 20
  • A pair of numbers which add up to 20
  • A number which can be added to 20
Which of the following is not a number bond to 20?
  • 17 + 3
  • 2 + 18
  • 19 + 4
  • 11 + 9
Which number is added to 10 to make 20?
  • 19
  • 10
  • 20
  • 2
Which set is correct?
  • 15 + 6 = 20, 6 + 15 = 20, 20 - 15 = 6, 20 - 6 = 15
  • 11 + 9 = 20, 9 + 11 = 20, 20 - 9 = 11, 20 - 11 = 9
  • 13 + 17 = 20, 17 + 13 = 20, 20 - 13 = 17, 20 - 17 = 13
  • 14 + 9 = 20, 9 + 14 = 20, 20 - 9 = 14, 20 - 14 = 9
If 13 + 7 = 20, then...
  • 7 - 13 = 20
  • 13 - 7 = 20
  • 13 - 20 = 7
  • 20 - 13 = 7
20 - 8 = ?
  • 15
  • 12
  • 8
  • 11
Which number is added to 14 to make 20?
  • 24
  • 10
  • 4
  • 6
If 6 + 14 = 20, then...
  • 20 - 6 = 14
  • 6 - 20 = 14
  • 14 - 20 = 6
  • 6 - 14 = 20
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