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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 648 · 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. 1.70 + ? = 100
  2. 2.4 + ? = 10
  3. 3.57 + ? = 100
  4. 4.17 + ? = 100
  5. 5.9 + ? = 10
  6. 6.5 + ? = 10
  7. 7.3 + ? = 10
  8. 8.6 + ? = 10
  9. 9.66 + ? = 100
  10. 10.89 + ? = 100
  11. 11.54 + ? = 100
  12. 12.2 + ? = 10
  13. 13.7 + ? = 10
  14. 14.8 + ? = 10
  15. 15.19 + ? = 100
  16. 16.34 + ? = 100
  17. 17.87 + ? = 100
  18. 18.15 + ? = 100
  19. 19.1 + ? = 10
  20. 20.81 + ? = 100
  21. 21.27 + ? = 100
  22. 22.42 + ? = 100
  23. 23.46 + ? = 100
  24. 24.38 + ? = 100
  25. 25.12 + ? = 100
  26. 26.35 + ? = 100
  27. 27.78 + ? = 100
  28. 28.45 + ? = 100
  29. 29.31 + ? = 100
  30. 30.47 + ? = 100
  31. 31.69 + ? = 100
  32. 32.64 + ? = 100
  33. 33.68 + ? = 100
  34. 34.25 + ? = 100
  35. 35.18 + ? = 100
  36. 36.82 + ? = 100
  37. 37.88 + ? = 100
  38. 38.86 + ? = 100
  39. 39.41 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 30
  2. 6
  3. 43
  4. 83
  5. 1
  6. 5
  7. 7
  8. 4
  9. 34
  10. 11
  11. 46
  12. 8
  13. 3
  14. 2
  15. 81
  16. 66
  17. 13
  18. 85
  19. 9
  20. 19
  21. 73
  22. 58
  23. 54
  24. 62
  25. 88
  26. 65
  27. 22
  28. 55
  29. 69
  30. 53
  31. 31
  32. 36
  33. 32
  34. 75
  35. 82
  36. 18
  37. 12
  38. 14
  39. 59
  40. 48

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