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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 215 · 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. 1.4 + ? = 10
  2. 2.58 + ? = 100
  3. 3.12 + ? = 100
  4. 4.16 + ? = 100
  5. 5.21 + ? = 100
  6. 6.23 + ? = 100
  7. 7.71 + ? = 100
  8. 8.82 + ? = 100
  9. 9.6 + ? = 10
  10. 10.2 + ? = 10
  11. 11.39 + ? = 100
  12. 12.33 + ? = 100
  13. 13.46 + ? = 100
  14. 14.51 + ? = 100
  15. 15.18 + ? = 100
  16. 16.78 + ? = 100
  17. 17.14 + ? = 100
  18. 18.38 + ? = 100
  19. 19.9 + ? = 10
  20. 20.1 + ? = 10
  21. 21.30 + ? = 100
  22. 22.77 + ? = 100
  23. 23.5 + ? = 10
  24. 24.87 + ? = 100
  25. 25.28 + ? = 100
  26. 26.43 + ? = 100
  27. 27.27 + ? = 100
  28. 28.69 + ? = 100
  29. 29.7 + ? = 10
  30. 30.15 + ? = 100
  31. 31.56 + ? = 100
  32. 32.72 + ? = 100
  33. 33.8 + ? = 10
  34. 34.42 + ? = 100
  35. 35.73 + ? = 100
  36. 36.11 + ? = 100
  37. 37.80 + ? = 100
  38. 38.31 + ? = 100
  39. 39.3 + ? = 10
  40. 40.55 + ? = 100

Answer key

  1. 6
  2. 42
  3. 88
  4. 84
  5. 79
  6. 77
  7. 29
  8. 18
  9. 4
  10. 8
  11. 61
  12. 67
  13. 54
  14. 49
  15. 82
  16. 22
  17. 86
  18. 62
  19. 1
  20. 9
  21. 70
  22. 23
  23. 5
  24. 13
  25. 72
  26. 57
  27. 73
  28. 31
  29. 3
  30. 85
  31. 44
  32. 28
  33. 2
  34. 58
  35. 27
  36. 89
  37. 20
  38. 69
  39. 7
  40. 45

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