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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 647 · 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. 1.3 + ? = 10
  2. 2.4 + ? = 10
  3. 3.8 + ? = 10
  4. 4.52 + ? = 100
  5. 5.35 + ? = 100
  6. 6.59 + ? = 100
  7. 7.25 + ? = 100
  8. 8.85 + ? = 100
  9. 9.30 + ? = 100
  10. 10.5 + ? = 10
  11. 11.7 + ? = 10
  12. 12.53 + ? = 100
  13. 13.77 + ? = 100
  14. 14.62 + ? = 100
  15. 15.89 + ? = 100
  16. 16.6 + ? = 10
  17. 17.9 + ? = 10
  18. 18.64 + ? = 100
  19. 19.2 + ? = 10
  20. 20.44 + ? = 100
  21. 21.70 + ? = 100
  22. 22.22 + ? = 100
  23. 23.15 + ? = 100
  24. 24.83 + ? = 100
  25. 25.61 + ? = 100
  26. 26.65 + ? = 100
  27. 27.14 + ? = 100
  28. 28.68 + ? = 100
  29. 29.13 + ? = 100
  30. 30.38 + ? = 100
  31. 31.82 + ? = 100
  32. 32.1 + ? = 10
  33. 33.63 + ? = 100
  34. 34.34 + ? = 100
  35. 35.81 + ? = 100
  36. 36.50 + ? = 100
  37. 37.87 + ? = 100
  38. 38.71 + ? = 100
  39. 39.32 + ? = 100
  40. 40.80 + ? = 100

Answer key

  1. 7
  2. 6
  3. 2
  4. 48
  5. 65
  6. 41
  7. 75
  8. 15
  9. 70
  10. 5
  11. 3
  12. 47
  13. 23
  14. 38
  15. 11
  16. 4
  17. 1
  18. 36
  19. 8
  20. 56
  21. 30
  22. 78
  23. 85
  24. 17
  25. 39
  26. 35
  27. 86
  28. 32
  29. 87
  30. 62
  31. 18
  32. 9
  33. 37
  34. 66
  35. 19
  36. 50
  37. 13
  38. 29
  39. 68
  40. 20

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