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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 233 · 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. 1.3 + ? = 10
  2. 2.23 + ? = 100
  3. 3.79 + ? = 100
  4. 4.1 + ? = 10
  5. 5.5 + ? = 10
  6. 6.8 + ? = 10
  7. 7.7 + ? = 10
  8. 8.4 + ? = 10
  9. 9.20 + ? = 100
  10. 10.31 + ? = 100
  11. 11.9 + ? = 10
  12. 12.15 + ? = 100
  13. 13.32 + ? = 100
  14. 14.18 + ? = 100
  15. 15.74 + ? = 100
  16. 16.30 + ? = 100
  17. 17.27 + ? = 100
  18. 18.69 + ? = 100
  19. 19.13 + ? = 100
  20. 20.26 + ? = 100
  21. 21.2 + ? = 10
  22. 22.14 + ? = 100
  23. 23.17 + ? = 100
  24. 24.16 + ? = 100
  25. 25.86 + ? = 100
  26. 26.62 + ? = 100
  27. 27.61 + ? = 100
  28. 28.28 + ? = 100
  29. 29.47 + ? = 100
  30. 30.51 + ? = 100
  31. 31.38 + ? = 100
  32. 32.43 + ? = 100
  33. 33.6 + ? = 10
  34. 34.89 + ? = 100
  35. 35.24 + ? = 100
  36. 36.87 + ? = 100
  37. 37.53 + ? = 100
  38. 38.45 + ? = 100
  39. 39.29 + ? = 100
  40. 40.50 + ? = 100

Answer key

  1. 7
  2. 77
  3. 21
  4. 9
  5. 5
  6. 2
  7. 3
  8. 6
  9. 80
  10. 69
  11. 1
  12. 85
  13. 68
  14. 82
  15. 26
  16. 70
  17. 73
  18. 31
  19. 87
  20. 74
  21. 8
  22. 86
  23. 83
  24. 84
  25. 14
  26. 38
  27. 39
  28. 72
  29. 53
  30. 49
  31. 62
  32. 57
  33. 4
  34. 11
  35. 76
  36. 13
  37. 47
  38. 55
  39. 71
  40. 50

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