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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 424 · 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. 1.5 + ? = 10
  2. 2.6 + ? = 10
  3. 3.1 + ? = 10
  4. 4.3 + ? = 10
  5. 5.72 + ? = 100
  6. 6.12 + ? = 100
  7. 7.16 + ? = 100
  8. 8.9 + ? = 10
  9. 9.46 + ? = 100
  10. 10.8 + ? = 10
  11. 11.22 + ? = 100
  12. 12.4 + ? = 10
  13. 13.64 + ? = 100
  14. 14.53 + ? = 100
  15. 15.51 + ? = 100
  16. 16.30 + ? = 100
  17. 17.84 + ? = 100
  18. 18.7 + ? = 10
  19. 19.31 + ? = 100
  20. 20.61 + ? = 100
  21. 21.47 + ? = 100
  22. 22.48 + ? = 100
  23. 23.17 + ? = 100
  24. 24.78 + ? = 100
  25. 25.65 + ? = 100
  26. 26.2 + ? = 10
  27. 27.58 + ? = 100
  28. 28.38 + ? = 100
  29. 29.42 + ? = 100
  30. 30.45 + ? = 100
  31. 31.69 + ? = 100
  32. 32.82 + ? = 100
  33. 33.25 + ? = 100
  34. 34.24 + ? = 100
  35. 35.80 + ? = 100
  36. 36.49 + ? = 100
  37. 37.23 + ? = 100
  38. 38.87 + ? = 100
  39. 39.79 + ? = 100
  40. 40.89 + ? = 100

Answer key

  1. 5
  2. 4
  3. 9
  4. 7
  5. 28
  6. 88
  7. 84
  8. 1
  9. 54
  10. 2
  11. 78
  12. 6
  13. 36
  14. 47
  15. 49
  16. 70
  17. 16
  18. 3
  19. 69
  20. 39
  21. 53
  22. 52
  23. 83
  24. 22
  25. 35
  26. 8
  27. 42
  28. 62
  29. 58
  30. 55
  31. 31
  32. 18
  33. 75
  34. 76
  35. 20
  36. 51
  37. 77
  38. 13
  39. 21
  40. 11

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