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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 657 · 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. 2.3 + ? = 10
  3. 3.1 + ? = 10
  4. 4.9 + ? = 10
  5. 5.2 + ? = 10
  6. 6.71 + ? = 100
  7. 7.21 + ? = 100
  8. 8.29 + ? = 100
  9. 9.4 + ? = 10
  10. 10.37 + ? = 100
  11. 11.73 + ? = 100
  12. 12.69 + ? = 100
  13. 13.11 + ? = 100
  14. 14.22 + ? = 100
  15. 15.70 + ? = 100
  16. 16.24 + ? = 100
  17. 17.62 + ? = 100
  18. 18.32 + ? = 100
  19. 19.47 + ? = 100
  20. 20.18 + ? = 100
  21. 21.58 + ? = 100
  22. 22.86 + ? = 100
  23. 23.17 + ? = 100
  24. 24.20 + ? = 100
  25. 25.64 + ? = 100
  26. 26.39 + ? = 100
  27. 27.43 + ? = 100
  28. 28.8 + ? = 10
  29. 29.60 + ? = 100
  30. 30.27 + ? = 100
  31. 31.52 + ? = 100
  32. 32.26 + ? = 100
  33. 33.83 + ? = 100
  34. 34.12 + ? = 100
  35. 35.35 + ? = 100
  36. 36.57 + ? = 100
  37. 37.67 + ? = 100
  38. 38.41 + ? = 100
  39. 39.80 + ? = 100
  40. 40.33 + ? = 100

Answer key

  1. 3
  2. 7
  3. 9
  4. 1
  5. 8
  6. 29
  7. 79
  8. 71
  9. 6
  10. 63
  11. 27
  12. 31
  13. 89
  14. 78
  15. 30
  16. 76
  17. 38
  18. 68
  19. 53
  20. 82
  21. 42
  22. 14
  23. 83
  24. 80
  25. 36
  26. 61
  27. 57
  28. 2
  29. 40
  30. 73
  31. 48
  32. 74
  33. 17
  34. 88
  35. 65
  36. 43
  37. 33
  38. 59
  39. 20
  40. 67

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