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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 65 · 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. 1.56 + ? = 100
  2. 2.78 + ? = 100
  3. 3.3 + ? = 10
  4. 4.1 + ? = 10
  5. 5.8 + ? = 10
  6. 6.39 + ? = 100
  7. 7.7 + ? = 10
  8. 8.51 + ? = 100
  9. 9.6 + ? = 10
  10. 10.67 + ? = 100
  11. 11.82 + ? = 100
  12. 12.11 + ? = 100
  13. 13.80 + ? = 100
  14. 14.50 + ? = 100
  15. 15.20 + ? = 100
  16. 16.14 + ? = 100
  17. 17.87 + ? = 100
  18. 18.21 + ? = 100
  19. 19.52 + ? = 100
  20. 20.66 + ? = 100
  21. 21.30 + ? = 100
  22. 22.9 + ? = 10
  23. 23.71 + ? = 100
  24. 24.28 + ? = 100
  25. 25.5 + ? = 10
  26. 26.89 + ? = 100
  27. 27.4 + ? = 10
  28. 28.2 + ? = 10
  29. 29.46 + ? = 100
  30. 30.41 + ? = 100
  31. 31.29 + ? = 100
  32. 32.47 + ? = 100
  33. 33.83 + ? = 100
  34. 34.15 + ? = 100
  35. 35.72 + ? = 100
  36. 36.84 + ? = 100
  37. 37.61 + ? = 100
  38. 38.75 + ? = 100
  39. 39.19 + ? = 100
  40. 40.22 + ? = 100

Answer key

  1. 44
  2. 22
  3. 7
  4. 9
  5. 2
  6. 61
  7. 3
  8. 49
  9. 4
  10. 33
  11. 18
  12. 89
  13. 20
  14. 50
  15. 80
  16. 86
  17. 13
  18. 79
  19. 48
  20. 34
  21. 70
  22. 1
  23. 29
  24. 72
  25. 5
  26. 11
  27. 6
  28. 8
  29. 54
  30. 59
  31. 71
  32. 53
  33. 17
  34. 85
  35. 28
  36. 16
  37. 39
  38. 25
  39. 81
  40. 78

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