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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 668 · 40 questions
TalentJR

How to do it in your head (Make 10): Bonds to 10: 1 + 9, 2 + 8, 3 + 7, 4 + 6, 5 + 5. Bonds to 100: the ones make 10, and the tens make 9 (because the ones already gave one ten). If the number ends in 0, the tens make 10: 40 + 60 = 100.

NameDateTime takenScore ___ / 40
  1. 1.7 + ? = 10
  2. 2.78 + ? = 100
  3. 3.1 + ? = 10
  4. 4.5 + ? = 10
  5. 5.14 + ? = 100
  6. 6.33 + ? = 100
  7. 7.2 + ? = 10
  8. 8.6 + ? = 10
  9. 9.53 + ? = 100
  10. 10.30 + ? = 100
  11. 11.12 + ? = 100
  12. 12.71 + ? = 100
  13. 13.8 + ? = 10
  14. 14.61 + ? = 100
  15. 15.81 + ? = 100
  16. 16.13 + ? = 100
  17. 17.40 + ? = 100
  18. 18.64 + ? = 100
  19. 19.4 + ? = 10
  20. 20.3 + ? = 10
  21. 21.21 + ? = 100
  22. 22.62 + ? = 100
  23. 23.28 + ? = 100
  24. 24.44 + ? = 100
  25. 25.72 + ? = 100
  26. 26.48 + ? = 100
  27. 27.83 + ? = 100
  28. 28.9 + ? = 10
  29. 29.31 + ? = 100
  30. 30.68 + ? = 100
  31. 31.36 + ? = 100
  32. 32.47 + ? = 100
  33. 33.41 + ? = 100
  34. 34.45 + ? = 100
  35. 35.50 + ? = 100
  36. 36.52 + ? = 100
  37. 37.65 + ? = 100
  38. 38.89 + ? = 100
  39. 39.26 + ? = 100
  40. 40.11 + ? = 100

Answer key

  1. 3
  2. 22
  3. 9
  4. 5
  5. 86
  6. 67
  7. 8
  8. 4
  9. 47
  10. 70
  11. 88
  12. 29
  13. 2
  14. 39
  15. 19
  16. 87
  17. 60
  18. 36
  19. 6
  20. 7
  21. 79
  22. 38
  23. 72
  24. 56
  25. 28
  26. 52
  27. 17
  28. 1
  29. 69
  30. 32
  31. 64
  32. 53
  33. 59
  34. 55
  35. 50
  36. 48
  37. 35
  38. 11
  39. 74
  40. 89

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