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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 278 · 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. 2.13 + ? = 100
  3. 3.5 + ? = 10
  4. 4.11 + ? = 100
  5. 5.2 + ? = 10
  6. 6.6 + ? = 10
  7. 7.35 + ? = 100
  8. 8.8 + ? = 10
  9. 9.54 + ? = 100
  10. 10.48 + ? = 100
  11. 11.55 + ? = 100
  12. 12.1 + ? = 10
  13. 13.7 + ? = 10
  14. 14.69 + ? = 100
  15. 15.14 + ? = 100
  16. 16.36 + ? = 100
  17. 17.79 + ? = 100
  18. 18.89 + ? = 100
  19. 19.38 + ? = 100
  20. 20.58 + ? = 100
  21. 21.30 + ? = 100
  22. 22.9 + ? = 10
  23. 23.84 + ? = 100
  24. 24.28 + ? = 100
  25. 25.3 + ? = 10
  26. 26.26 + ? = 100
  27. 27.61 + ? = 100
  28. 28.62 + ? = 100
  29. 29.34 + ? = 100
  30. 30.25 + ? = 100
  31. 31.39 + ? = 100
  32. 32.70 + ? = 100
  33. 33.45 + ? = 100
  34. 34.49 + ? = 100
  35. 35.67 + ? = 100
  36. 36.42 + ? = 100
  37. 37.20 + ? = 100
  38. 38.71 + ? = 100
  39. 39.56 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 6
  2. 87
  3. 5
  4. 89
  5. 8
  6. 4
  7. 65
  8. 2
  9. 46
  10. 52
  11. 45
  12. 9
  13. 3
  14. 31
  15. 86
  16. 64
  17. 21
  18. 11
  19. 62
  20. 42
  21. 70
  22. 1
  23. 16
  24. 72
  25. 7
  26. 74
  27. 39
  28. 38
  29. 66
  30. 75
  31. 61
  32. 30
  33. 55
  34. 51
  35. 33
  36. 58
  37. 80
  38. 29
  39. 44
  40. 22

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