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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 542 · 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. 1.55 + ? = 100
  2. 2.50 + ? = 100
  3. 3.64 + ? = 100
  4. 4.13 + ? = 100
  5. 5.42 + ? = 100
  6. 6.8 + ? = 10
  7. 7.21 + ? = 100
  8. 8.30 + ? = 100
  9. 9.66 + ? = 100
  10. 10.5 + ? = 10
  11. 11.34 + ? = 100
  12. 12.86 + ? = 100
  13. 13.2 + ? = 10
  14. 14.4 + ? = 10
  15. 15.78 + ? = 100
  16. 16.1 + ? = 10
  17. 17.69 + ? = 100
  18. 18.31 + ? = 100
  19. 19.12 + ? = 100
  20. 20.3 + ? = 10
  21. 21.62 + ? = 100
  22. 22.27 + ? = 100
  23. 23.17 + ? = 100
  24. 24.60 + ? = 100
  25. 25.7 + ? = 10
  26. 26.38 + ? = 100
  27. 27.9 + ? = 10
  28. 28.53 + ? = 100
  29. 29.70 + ? = 100
  30. 30.56 + ? = 100
  31. 31.33 + ? = 100
  32. 32.48 + ? = 100
  33. 33.52 + ? = 100
  34. 34.15 + ? = 100
  35. 35.36 + ? = 100
  36. 36.79 + ? = 100
  37. 37.6 + ? = 10
  38. 38.80 + ? = 100
  39. 39.58 + ? = 100
  40. 40.23 + ? = 100

Answer key

  1. 45
  2. 50
  3. 36
  4. 87
  5. 58
  6. 2
  7. 79
  8. 70
  9. 34
  10. 5
  11. 66
  12. 14
  13. 8
  14. 6
  15. 22
  16. 9
  17. 31
  18. 69
  19. 88
  20. 7
  21. 38
  22. 73
  23. 83
  24. 40
  25. 3
  26. 62
  27. 1
  28. 47
  29. 30
  30. 44
  31. 67
  32. 52
  33. 48
  34. 85
  35. 64
  36. 21
  37. 4
  38. 20
  39. 42
  40. 77

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