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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 379 · 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. 1.67 + ? = 100
  2. 2.77 + ? = 100
  3. 3.2 + ? = 10
  4. 4.7 + ? = 10
  5. 5.4 + ? = 10
  6. 6.8 + ? = 10
  7. 7.9 + ? = 10
  8. 8.57 + ? = 100
  9. 9.88 + ? = 100
  10. 10.58 + ? = 100
  11. 11.21 + ? = 100
  12. 12.19 + ? = 100
  13. 13.23 + ? = 100
  14. 14.14 + ? = 100
  15. 15.16 + ? = 100
  16. 16.84 + ? = 100
  17. 17.6 + ? = 10
  18. 18.18 + ? = 100
  19. 19.3 + ? = 10
  20. 20.38 + ? = 100
  21. 21.72 + ? = 100
  22. 22.81 + ? = 100
  23. 23.45 + ? = 100
  24. 24.5 + ? = 10
  25. 25.35 + ? = 100
  26. 26.73 + ? = 100
  27. 27.13 + ? = 100
  28. 28.1 + ? = 10
  29. 29.20 + ? = 100
  30. 30.15 + ? = 100
  31. 31.74 + ? = 100
  32. 32.25 + ? = 100
  33. 33.17 + ? = 100
  34. 34.82 + ? = 100
  35. 35.50 + ? = 100
  36. 36.66 + ? = 100
  37. 37.65 + ? = 100
  38. 38.54 + ? = 100
  39. 39.80 + ? = 100
  40. 40.68 + ? = 100

Answer key

  1. 33
  2. 23
  3. 8
  4. 3
  5. 6
  6. 2
  7. 1
  8. 43
  9. 12
  10. 42
  11. 79
  12. 81
  13. 77
  14. 86
  15. 84
  16. 16
  17. 4
  18. 82
  19. 7
  20. 62
  21. 28
  22. 19
  23. 55
  24. 5
  25. 65
  26. 27
  27. 87
  28. 9
  29. 80
  30. 85
  31. 26
  32. 75
  33. 83
  34. 18
  35. 50
  36. 34
  37. 35
  38. 46
  39. 20
  40. 32

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