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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 83 · 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. 2.2 + ? = 10
  3. 3.38 + ? = 100
  4. 4.9 + ? = 10
  5. 5.7 + ? = 10
  6. 6.45 + ? = 100
  7. 7.6 + ? = 10
  8. 8.5 + ? = 10
  9. 9.4 + ? = 10
  10. 10.11 + ? = 100
  11. 11.83 + ? = 100
  12. 12.1 + ? = 10
  13. 13.40 + ? = 100
  14. 14.8 + ? = 10
  15. 15.55 + ? = 100
  16. 16.63 + ? = 100
  17. 17.54 + ? = 100
  18. 18.59 + ? = 100
  19. 19.35 + ? = 100
  20. 20.30 + ? = 100
  21. 21.60 + ? = 100
  22. 22.74 + ? = 100
  23. 23.27 + ? = 100
  24. 24.42 + ? = 100
  25. 25.43 + ? = 100
  26. 26.62 + ? = 100
  27. 27.13 + ? = 100
  28. 28.44 + ? = 100
  29. 29.69 + ? = 100
  30. 30.75 + ? = 100
  31. 31.48 + ? = 100
  32. 32.17 + ? = 100
  33. 33.20 + ? = 100
  34. 34.78 + ? = 100
  35. 35.15 + ? = 100
  36. 36.52 + ? = 100
  37. 37.34 + ? = 100
  38. 38.31 + ? = 100
  39. 39.65 + ? = 100
  40. 40.89 + ? = 100

Answer key

  1. 7
  2. 8
  3. 62
  4. 1
  5. 3
  6. 55
  7. 4
  8. 5
  9. 6
  10. 89
  11. 17
  12. 9
  13. 60
  14. 2
  15. 45
  16. 37
  17. 46
  18. 41
  19. 65
  20. 70
  21. 40
  22. 26
  23. 73
  24. 58
  25. 57
  26. 38
  27. 87
  28. 56
  29. 31
  30. 25
  31. 52
  32. 83
  33. 80
  34. 22
  35. 85
  36. 48
  37. 66
  38. 69
  39. 35
  40. 11

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