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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 397 · 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. 1.6 + ? = 10
  2. 2.1 + ? = 10
  3. 3.65 + ? = 100
  4. 4.5 + ? = 10
  5. 5.3 + ? = 10
  6. 6.49 + ? = 100
  7. 7.4 + ? = 10
  8. 8.42 + ? = 100
  9. 9.12 + ? = 100
  10. 10.30 + ? = 100
  11. 11.54 + ? = 100
  12. 12.13 + ? = 100
  13. 13.2 + ? = 10
  14. 14.14 + ? = 100
  15. 15.34 + ? = 100
  16. 16.8 + ? = 10
  17. 17.40 + ? = 100
  18. 18.61 + ? = 100
  19. 19.39 + ? = 100
  20. 20.15 + ? = 100
  21. 21.68 + ? = 100
  22. 22.26 + ? = 100
  23. 23.38 + ? = 100
  24. 24.60 + ? = 100
  25. 25.74 + ? = 100
  26. 26.7 + ? = 10
  27. 27.9 + ? = 10
  28. 28.46 + ? = 100
  29. 29.45 + ? = 100
  30. 30.72 + ? = 100
  31. 31.84 + ? = 100
  32. 32.37 + ? = 100
  33. 33.75 + ? = 100
  34. 34.87 + ? = 100
  35. 35.70 + ? = 100
  36. 36.47 + ? = 100
  37. 37.81 + ? = 100
  38. 38.43 + ? = 100
  39. 39.17 + ? = 100
  40. 40.86 + ? = 100

Answer key

  1. 4
  2. 9
  3. 35
  4. 5
  5. 7
  6. 51
  7. 6
  8. 58
  9. 88
  10. 70
  11. 46
  12. 87
  13. 8
  14. 86
  15. 66
  16. 2
  17. 60
  18. 39
  19. 61
  20. 85
  21. 32
  22. 74
  23. 62
  24. 40
  25. 26
  26. 3
  27. 1
  28. 54
  29. 55
  30. 28
  31. 16
  32. 63
  33. 25
  34. 13
  35. 30
  36. 53
  37. 19
  38. 57
  39. 83
  40. 14

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