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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 156 · 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. 1.85 + ? = 100
  2. 2.20 + ? = 100
  3. 3.29 + ? = 100
  4. 4.38 + ? = 100
  5. 5.61 + ? = 100
  6. 6.77 + ? = 100
  7. 7.1 + ? = 10
  8. 8.25 + ? = 100
  9. 9.88 + ? = 100
  10. 10.5 + ? = 10
  11. 11.73 + ? = 100
  12. 12.4 + ? = 10
  13. 13.39 + ? = 100
  14. 14.48 + ? = 100
  15. 15.19 + ? = 100
  16. 16.7 + ? = 10
  17. 17.89 + ? = 100
  18. 18.3 + ? = 10
  19. 19.69 + ? = 100
  20. 20.35 + ? = 100
  21. 21.84 + ? = 100
  22. 22.8 + ? = 10
  23. 23.12 + ? = 100
  24. 24.62 + ? = 100
  25. 25.34 + ? = 100
  26. 26.52 + ? = 100
  27. 27.15 + ? = 100
  28. 28.87 + ? = 100
  29. 29.45 + ? = 100
  30. 30.42 + ? = 100
  31. 31.57 + ? = 100
  32. 32.68 + ? = 100
  33. 33.55 + ? = 100
  34. 34.16 + ? = 100
  35. 35.2 + ? = 10
  36. 36.59 + ? = 100
  37. 37.46 + ? = 100
  38. 38.9 + ? = 10
  39. 39.13 + ? = 100
  40. 40.30 + ? = 100

Answer key

  1. 15
  2. 80
  3. 71
  4. 62
  5. 39
  6. 23
  7. 9
  8. 75
  9. 12
  10. 5
  11. 27
  12. 6
  13. 61
  14. 52
  15. 81
  16. 3
  17. 11
  18. 7
  19. 31
  20. 65
  21. 16
  22. 2
  23. 88
  24. 38
  25. 66
  26. 48
  27. 85
  28. 13
  29. 55
  30. 58
  31. 43
  32. 32
  33. 45
  34. 84
  35. 8
  36. 41
  37. 54
  38. 1
  39. 87
  40. 70

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