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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 455 · 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. 1.9 + ? = 10
  2. 2.37 + ? = 100
  3. 3.4 + ? = 10
  4. 4.1 + ? = 10
  5. 5.75 + ? = 100
  6. 6.15 + ? = 100
  7. 7.36 + ? = 100
  8. 8.5 + ? = 10
  9. 9.30 + ? = 100
  10. 10.60 + ? = 100
  11. 11.3 + ? = 10
  12. 12.6 + ? = 10
  13. 13.40 + ? = 100
  14. 14.33 + ? = 100
  15. 15.48 + ? = 100
  16. 16.2 + ? = 10
  17. 17.7 + ? = 10
  18. 18.63 + ? = 100
  19. 19.26 + ? = 100
  20. 20.84 + ? = 100
  21. 21.12 + ? = 100
  22. 22.17 + ? = 100
  23. 23.61 + ? = 100
  24. 24.72 + ? = 100
  25. 25.22 + ? = 100
  26. 26.59 + ? = 100
  27. 27.32 + ? = 100
  28. 28.42 + ? = 100
  29. 29.88 + ? = 100
  30. 30.8 + ? = 10
  31. 31.27 + ? = 100
  32. 32.21 + ? = 100
  33. 33.85 + ? = 100
  34. 34.18 + ? = 100
  35. 35.41 + ? = 100
  36. 36.29 + ? = 100
  37. 37.64 + ? = 100
  38. 38.35 + ? = 100
  39. 39.14 + ? = 100
  40. 40.65 + ? = 100

Answer key

  1. 1
  2. 63
  3. 6
  4. 9
  5. 25
  6. 85
  7. 64
  8. 5
  9. 70
  10. 40
  11. 7
  12. 4
  13. 60
  14. 67
  15. 52
  16. 8
  17. 3
  18. 37
  19. 74
  20. 16
  21. 88
  22. 83
  23. 39
  24. 28
  25. 78
  26. 41
  27. 68
  28. 58
  29. 12
  30. 2
  31. 73
  32. 79
  33. 15
  34. 82
  35. 59
  36. 71
  37. 36
  38. 65
  39. 86
  40. 35

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