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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 548 · 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. 1.4 + ? = 10
  2. 2.7 + ? = 10
  3. 3.88 + ? = 100
  4. 4.6 + ? = 10
  5. 5.60 + ? = 100
  6. 6.20 + ? = 100
  7. 7.43 + ? = 100
  8. 8.87 + ? = 100
  9. 9.17 + ? = 100
  10. 10.3 + ? = 10
  11. 11.5 + ? = 10
  12. 12.89 + ? = 100
  13. 13.57 + ? = 100
  14. 14.1 + ? = 10
  15. 15.28 + ? = 100
  16. 16.37 + ? = 100
  17. 17.35 + ? = 100
  18. 18.77 + ? = 100
  19. 19.50 + ? = 100
  20. 20.47 + ? = 100
  21. 21.2 + ? = 10
  22. 22.71 + ? = 100
  23. 23.68 + ? = 100
  24. 24.31 + ? = 100
  25. 25.24 + ? = 100
  26. 26.27 + ? = 100
  27. 27.8 + ? = 10
  28. 28.49 + ? = 100
  29. 29.42 + ? = 100
  30. 30.80 + ? = 100
  31. 31.40 + ? = 100
  32. 32.15 + ? = 100
  33. 33.9 + ? = 10
  34. 34.86 + ? = 100
  35. 35.11 + ? = 100
  36. 36.39 + ? = 100
  37. 37.26 + ? = 100
  38. 38.64 + ? = 100
  39. 39.16 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 6
  2. 3
  3. 12
  4. 4
  5. 40
  6. 80
  7. 57
  8. 13
  9. 83
  10. 7
  11. 5
  12. 11
  13. 43
  14. 9
  15. 72
  16. 63
  17. 65
  18. 23
  19. 50
  20. 53
  21. 8
  22. 29
  23. 32
  24. 69
  25. 76
  26. 73
  27. 2
  28. 51
  29. 58
  30. 20
  31. 60
  32. 85
  33. 1
  34. 14
  35. 89
  36. 61
  37. 74
  38. 36
  39. 84
  40. 22

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