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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 553 · 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. 1.2 + ? = 10
  2. 2.6 + ? = 10
  3. 3.42 + ? = 100
  4. 4.4 + ? = 10
  5. 5.5 + ? = 10
  6. 6.21 + ? = 100
  7. 7.41 + ? = 100
  8. 8.1 + ? = 10
  9. 9.30 + ? = 100
  10. 10.74 + ? = 100
  11. 11.16 + ? = 100
  12. 12.48 + ? = 100
  13. 13.15 + ? = 100
  14. 14.3 + ? = 10
  15. 15.23 + ? = 100
  16. 16.12 + ? = 100
  17. 17.59 + ? = 100
  18. 18.11 + ? = 100
  19. 19.7 + ? = 10
  20. 20.40 + ? = 100
  21. 21.22 + ? = 100
  22. 22.8 + ? = 10
  23. 23.51 + ? = 100
  24. 24.54 + ? = 100
  25. 25.9 + ? = 10
  26. 26.43 + ? = 100
  27. 27.28 + ? = 100
  28. 28.44 + ? = 100
  29. 29.20 + ? = 100
  30. 30.52 + ? = 100
  31. 31.36 + ? = 100
  32. 32.82 + ? = 100
  33. 33.83 + ? = 100
  34. 34.68 + ? = 100
  35. 35.78 + ? = 100
  36. 36.84 + ? = 100
  37. 37.17 + ? = 100
  38. 38.53 + ? = 100
  39. 39.32 + ? = 100
  40. 40.55 + ? = 100

Answer key

  1. 8
  2. 4
  3. 58
  4. 6
  5. 5
  6. 79
  7. 59
  8. 9
  9. 70
  10. 26
  11. 84
  12. 52
  13. 85
  14. 7
  15. 77
  16. 88
  17. 41
  18. 89
  19. 3
  20. 60
  21. 78
  22. 2
  23. 49
  24. 46
  25. 1
  26. 57
  27. 72
  28. 56
  29. 80
  30. 48
  31. 64
  32. 18
  33. 17
  34. 32
  35. 22
  36. 16
  37. 83
  38. 47
  39. 68
  40. 45

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