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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 187 · 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. 1.26 + ? = 100
  2. 2.35 + ? = 100
  3. 3.1 + ? = 10
  4. 4.9 + ? = 10
  5. 5.82 + ? = 100
  6. 6.4 + ? = 10
  7. 7.13 + ? = 100
  8. 8.80 + ? = 100
  9. 9.3 + ? = 10
  10. 10.49 + ? = 100
  11. 11.5 + ? = 10
  12. 12.86 + ? = 100
  13. 13.8 + ? = 10
  14. 14.7 + ? = 10
  15. 15.28 + ? = 100
  16. 16.2 + ? = 10
  17. 17.62 + ? = 100
  18. 18.11 + ? = 100
  19. 19.73 + ? = 100
  20. 20.6 + ? = 10
  21. 21.65 + ? = 100
  22. 22.83 + ? = 100
  23. 23.71 + ? = 100
  24. 24.15 + ? = 100
  25. 25.27 + ? = 100
  26. 26.63 + ? = 100
  27. 27.58 + ? = 100
  28. 28.52 + ? = 100
  29. 29.89 + ? = 100
  30. 30.20 + ? = 100
  31. 31.21 + ? = 100
  32. 32.68 + ? = 100
  33. 33.47 + ? = 100
  34. 34.40 + ? = 100
  35. 35.46 + ? = 100
  36. 36.36 + ? = 100
  37. 37.64 + ? = 100
  38. 38.43 + ? = 100
  39. 39.59 + ? = 100
  40. 40.22 + ? = 100

Answer key

  1. 74
  2. 65
  3. 9
  4. 1
  5. 18
  6. 6
  7. 87
  8. 20
  9. 7
  10. 51
  11. 5
  12. 14
  13. 2
  14. 3
  15. 72
  16. 8
  17. 38
  18. 89
  19. 27
  20. 4
  21. 35
  22. 17
  23. 29
  24. 85
  25. 73
  26. 37
  27. 42
  28. 48
  29. 11
  30. 80
  31. 79
  32. 32
  33. 53
  34. 60
  35. 54
  36. 64
  37. 36
  38. 57
  39. 41
  40. 78

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