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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 168 · 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. 1.57 + ? = 100
  2. 2.18 + ? = 100
  3. 3.86 + ? = 100
  4. 4.8 + ? = 10
  5. 5.46 + ? = 100
  6. 6.21 + ? = 100
  7. 7.70 + ? = 100
  8. 8.6 + ? = 10
  9. 9.2 + ? = 10
  10. 10.26 + ? = 100
  11. 11.7 + ? = 10
  12. 12.45 + ? = 100
  13. 13.42 + ? = 100
  14. 14.76 + ? = 100
  15. 15.1 + ? = 10
  16. 16.29 + ? = 100
  17. 17.49 + ? = 100
  18. 18.38 + ? = 100
  19. 19.47 + ? = 100
  20. 20.11 + ? = 100
  21. 21.77 + ? = 100
  22. 22.13 + ? = 100
  23. 23.55 + ? = 100
  24. 24.19 + ? = 100
  25. 25.33 + ? = 100
  26. 26.66 + ? = 100
  27. 27.83 + ? = 100
  28. 28.4 + ? = 10
  29. 29.37 + ? = 100
  30. 30.5 + ? = 10
  31. 31.24 + ? = 100
  32. 32.9 + ? = 10
  33. 33.22 + ? = 100
  34. 34.34 + ? = 100
  35. 35.48 + ? = 100
  36. 36.27 + ? = 100
  37. 37.3 + ? = 10
  38. 38.35 + ? = 100
  39. 39.25 + ? = 100
  40. 40.85 + ? = 100

Answer key

  1. 43
  2. 82
  3. 14
  4. 2
  5. 54
  6. 79
  7. 30
  8. 4
  9. 8
  10. 74
  11. 3
  12. 55
  13. 58
  14. 24
  15. 9
  16. 71
  17. 51
  18. 62
  19. 53
  20. 89
  21. 23
  22. 87
  23. 45
  24. 81
  25. 67
  26. 34
  27. 17
  28. 6
  29. 63
  30. 5
  31. 76
  32. 1
  33. 78
  34. 66
  35. 52
  36. 73
  37. 7
  38. 65
  39. 75
  40. 15

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