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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 357 · 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. 1.6 + ? = 10
  2. 2.7 + ? = 10
  3. 3.36 + ? = 100
  4. 4.8 + ? = 10
  5. 5.86 + ? = 100
  6. 6.83 + ? = 100
  7. 7.38 + ? = 100
  8. 8.5 + ? = 10
  9. 9.85 + ? = 100
  10. 10.4 + ? = 10
  11. 11.1 + ? = 10
  12. 12.13 + ? = 100
  13. 13.69 + ? = 100
  14. 14.27 + ? = 100
  15. 15.3 + ? = 10
  16. 16.23 + ? = 100
  17. 17.14 + ? = 100
  18. 18.18 + ? = 100
  19. 19.55 + ? = 100
  20. 20.52 + ? = 100
  21. 21.30 + ? = 100
  22. 22.9 + ? = 10
  23. 23.78 + ? = 100
  24. 24.80 + ? = 100
  25. 25.2 + ? = 10
  26. 26.79 + ? = 100
  27. 27.35 + ? = 100
  28. 28.41 + ? = 100
  29. 29.29 + ? = 100
  30. 30.40 + ? = 100
  31. 31.17 + ? = 100
  32. 32.34 + ? = 100
  33. 33.82 + ? = 100
  34. 34.68 + ? = 100
  35. 35.43 + ? = 100
  36. 36.72 + ? = 100
  37. 37.66 + ? = 100
  38. 38.15 + ? = 100
  39. 39.12 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 4
  2. 3
  3. 64
  4. 2
  5. 14
  6. 17
  7. 62
  8. 5
  9. 15
  10. 6
  11. 9
  12. 87
  13. 31
  14. 73
  15. 7
  16. 77
  17. 86
  18. 82
  19. 45
  20. 48
  21. 70
  22. 1
  23. 22
  24. 20
  25. 8
  26. 21
  27. 65
  28. 59
  29. 71
  30. 60
  31. 83
  32. 66
  33. 18
  34. 32
  35. 57
  36. 28
  37. 34
  38. 85
  39. 88
  40. 81

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