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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 425 · 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. 1.9 + ? = 10
  2. 2.47 + ? = 100
  3. 3.65 + ? = 100
  4. 4.1 + ? = 10
  5. 5.33 + ? = 100
  6. 6.2 + ? = 10
  7. 7.5 + ? = 10
  8. 8.7 + ? = 10
  9. 9.6 + ? = 10
  10. 10.81 + ? = 100
  11. 11.34 + ? = 100
  12. 12.8 + ? = 10
  13. 13.17 + ? = 100
  14. 14.64 + ? = 100
  15. 15.12 + ? = 100
  16. 16.4 + ? = 10
  17. 17.53 + ? = 100
  18. 18.67 + ? = 100
  19. 19.32 + ? = 100
  20. 20.49 + ? = 100
  21. 21.11 + ? = 100
  22. 22.14 + ? = 100
  23. 23.27 + ? = 100
  24. 24.3 + ? = 10
  25. 25.24 + ? = 100
  26. 26.38 + ? = 100
  27. 27.86 + ? = 100
  28. 28.45 + ? = 100
  29. 29.51 + ? = 100
  30. 30.18 + ? = 100
  31. 31.83 + ? = 100
  32. 32.78 + ? = 100
  33. 33.30 + ? = 100
  34. 34.20 + ? = 100
  35. 35.54 + ? = 100
  36. 36.23 + ? = 100
  37. 37.85 + ? = 100
  38. 38.29 + ? = 100
  39. 39.57 + ? = 100
  40. 40.66 + ? = 100

Answer key

  1. 1
  2. 53
  3. 35
  4. 9
  5. 67
  6. 8
  7. 5
  8. 3
  9. 4
  10. 19
  11. 66
  12. 2
  13. 83
  14. 36
  15. 88
  16. 6
  17. 47
  18. 33
  19. 68
  20. 51
  21. 89
  22. 86
  23. 73
  24. 7
  25. 76
  26. 62
  27. 14
  28. 55
  29. 49
  30. 82
  31. 17
  32. 22
  33. 70
  34. 80
  35. 46
  36. 77
  37. 15
  38. 71
  39. 43
  40. 34

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