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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 487 · 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. 1.61 + ? = 100
  2. 2.85 + ? = 100
  3. 3.64 + ? = 100
  4. 4.19 + ? = 100
  5. 5.8 + ? = 10
  6. 6.39 + ? = 100
  7. 7.21 + ? = 100
  8. 8.11 + ? = 100
  9. 9.4 + ? = 10
  10. 10.3 + ? = 10
  11. 11.1 + ? = 10
  12. 12.27 + ? = 100
  13. 13.5 + ? = 10
  14. 14.25 + ? = 100
  15. 15.66 + ? = 100
  16. 16.2 + ? = 10
  17. 17.9 + ? = 10
  18. 18.38 + ? = 100
  19. 19.84 + ? = 100
  20. 20.74 + ? = 100
  21. 21.54 + ? = 100
  22. 22.79 + ? = 100
  23. 23.63 + ? = 100
  24. 24.88 + ? = 100
  25. 25.6 + ? = 10
  26. 26.7 + ? = 10
  27. 27.45 + ? = 100
  28. 28.69 + ? = 100
  29. 29.83 + ? = 100
  30. 30.14 + ? = 100
  31. 31.51 + ? = 100
  32. 32.29 + ? = 100
  33. 33.15 + ? = 100
  34. 34.37 + ? = 100
  35. 35.34 + ? = 100
  36. 36.12 + ? = 100
  37. 37.65 + ? = 100
  38. 38.68 + ? = 100
  39. 39.62 + ? = 100
  40. 40.72 + ? = 100

Answer key

  1. 39
  2. 15
  3. 36
  4. 81
  5. 2
  6. 61
  7. 79
  8. 89
  9. 6
  10. 7
  11. 9
  12. 73
  13. 5
  14. 75
  15. 34
  16. 8
  17. 1
  18. 62
  19. 16
  20. 26
  21. 46
  22. 21
  23. 37
  24. 12
  25. 4
  26. 3
  27. 55
  28. 31
  29. 17
  30. 86
  31. 49
  32. 71
  33. 85
  34. 63
  35. 66
  36. 88
  37. 35
  38. 32
  39. 38
  40. 28

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