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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 45 · 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. 1.65 + ? = 100
  2. 2.32 + ? = 100
  3. 3.88 + ? = 100
  4. 4.6 + ? = 10
  5. 5.41 + ? = 100
  6. 6.85 + ? = 100
  7. 7.1 + ? = 10
  8. 8.4 + ? = 10
  9. 9.87 + ? = 100
  10. 10.33 + ? = 100
  11. 11.31 + ? = 100
  12. 12.63 + ? = 100
  13. 13.35 + ? = 100
  14. 14.73 + ? = 100
  15. 15.24 + ? = 100
  16. 16.17 + ? = 100
  17. 17.9 + ? = 10
  18. 18.43 + ? = 100
  19. 19.7 + ? = 10
  20. 20.18 + ? = 100
  21. 21.3 + ? = 10
  22. 22.15 + ? = 100
  23. 23.60 + ? = 100
  24. 24.12 + ? = 100
  25. 25.8 + ? = 10
  26. 26.29 + ? = 100
  27. 27.2 + ? = 10
  28. 28.26 + ? = 100
  29. 29.22 + ? = 100
  30. 30.72 + ? = 100
  31. 31.5 + ? = 10
  32. 32.11 + ? = 100
  33. 33.86 + ? = 100
  34. 34.69 + ? = 100
  35. 35.52 + ? = 100
  36. 36.27 + ? = 100
  37. 37.30 + ? = 100
  38. 38.89 + ? = 100
  39. 39.23 + ? = 100
  40. 40.74 + ? = 100

Answer key

  1. 35
  2. 68
  3. 12
  4. 4
  5. 59
  6. 15
  7. 9
  8. 6
  9. 13
  10. 67
  11. 69
  12. 37
  13. 65
  14. 27
  15. 76
  16. 83
  17. 1
  18. 57
  19. 3
  20. 82
  21. 7
  22. 85
  23. 40
  24. 88
  25. 2
  26. 71
  27. 8
  28. 74
  29. 78
  30. 28
  31. 5
  32. 89
  33. 14
  34. 31
  35. 48
  36. 73
  37. 70
  38. 11
  39. 77
  40. 26

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