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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 209 · 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. 1.5 + ? = 10
  2. 2.7 + ? = 10
  3. 3.31 + ? = 100
  4. 4.9 + ? = 10
  5. 5.3 + ? = 10
  6. 6.20 + ? = 100
  7. 7.2 + ? = 10
  8. 8.37 + ? = 100
  9. 9.70 + ? = 100
  10. 10.52 + ? = 100
  11. 11.13 + ? = 100
  12. 12.8 + ? = 10
  13. 13.87 + ? = 100
  14. 14.6 + ? = 10
  15. 15.82 + ? = 100
  16. 16.18 + ? = 100
  17. 17.28 + ? = 100
  18. 18.21 + ? = 100
  19. 19.43 + ? = 100
  20. 20.17 + ? = 100
  21. 21.1 + ? = 10
  22. 22.11 + ? = 100
  23. 23.62 + ? = 100
  24. 24.59 + ? = 100
  25. 25.63 + ? = 100
  26. 26.38 + ? = 100
  27. 27.66 + ? = 100
  28. 28.71 + ? = 100
  29. 29.61 + ? = 100
  30. 30.74 + ? = 100
  31. 31.40 + ? = 100
  32. 32.41 + ? = 100
  33. 33.36 + ? = 100
  34. 34.85 + ? = 100
  35. 35.27 + ? = 100
  36. 36.26 + ? = 100
  37. 37.56 + ? = 100
  38. 38.50 + ? = 100
  39. 39.46 + ? = 100
  40. 40.12 + ? = 100

Answer key

  1. 5
  2. 3
  3. 69
  4. 1
  5. 7
  6. 80
  7. 8
  8. 63
  9. 30
  10. 48
  11. 87
  12. 2
  13. 13
  14. 4
  15. 18
  16. 82
  17. 72
  18. 79
  19. 57
  20. 83
  21. 9
  22. 89
  23. 38
  24. 41
  25. 37
  26. 62
  27. 34
  28. 29
  29. 39
  30. 26
  31. 60
  32. 59
  33. 64
  34. 15
  35. 73
  36. 74
  37. 44
  38. 50
  39. 54
  40. 88

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