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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 219 · 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. 1.7 + ? = 10
  2. 2.1 + ? = 10
  3. 3.5 + ? = 10
  4. 4.38 + ? = 100
  5. 5.8 + ? = 10
  6. 6.30 + ? = 100
  7. 7.2 + ? = 10
  8. 8.22 + ? = 100
  9. 9.28 + ? = 100
  10. 10.66 + ? = 100
  11. 11.25 + ? = 100
  12. 12.3 + ? = 10
  13. 13.11 + ? = 100
  14. 14.14 + ? = 100
  15. 15.6 + ? = 10
  16. 16.41 + ? = 100
  17. 17.19 + ? = 100
  18. 18.9 + ? = 10
  19. 19.4 + ? = 10
  20. 20.67 + ? = 100
  21. 21.24 + ? = 100
  22. 22.23 + ? = 100
  23. 23.69 + ? = 100
  24. 24.78 + ? = 100
  25. 25.72 + ? = 100
  26. 26.89 + ? = 100
  27. 27.31 + ? = 100
  28. 28.59 + ? = 100
  29. 29.17 + ? = 100
  30. 30.75 + ? = 100
  31. 31.12 + ? = 100
  32. 32.27 + ? = 100
  33. 33.47 + ? = 100
  34. 34.87 + ? = 100
  35. 35.39 + ? = 100
  36. 36.15 + ? = 100
  37. 37.74 + ? = 100
  38. 38.88 + ? = 100
  39. 39.65 + ? = 100
  40. 40.54 + ? = 100

Answer key

  1. 3
  2. 9
  3. 5
  4. 62
  5. 2
  6. 70
  7. 8
  8. 78
  9. 72
  10. 34
  11. 75
  12. 7
  13. 89
  14. 86
  15. 4
  16. 59
  17. 81
  18. 1
  19. 6
  20. 33
  21. 76
  22. 77
  23. 31
  24. 22
  25. 28
  26. 11
  27. 69
  28. 41
  29. 83
  30. 25
  31. 88
  32. 73
  33. 53
  34. 13
  35. 61
  36. 85
  37. 26
  38. 12
  39. 35
  40. 46

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