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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 4 · 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. 2.3 + ? = 10
  3. 3.37 + ? = 100
  4. 4.49 + ? = 100
  5. 5.27 + ? = 100
  6. 6.2 + ? = 10
  7. 7.61 + ? = 100
  8. 8.4 + ? = 10
  9. 9.54 + ? = 100
  10. 10.5 + ? = 10
  11. 11.30 + ? = 100
  12. 12.7 + ? = 10
  13. 13.21 + ? = 100
  14. 14.77 + ? = 100
  15. 15.46 + ? = 100
  16. 16.45 + ? = 100
  17. 17.34 + ? = 100
  18. 18.88 + ? = 100
  19. 19.48 + ? = 100
  20. 20.51 + ? = 100
  21. 21.71 + ? = 100
  22. 22.31 + ? = 100
  23. 23.52 + ? = 100
  24. 24.43 + ? = 100
  25. 25.1 + ? = 10
  26. 26.28 + ? = 100
  27. 27.6 + ? = 10
  28. 28.73 + ? = 100
  29. 29.16 + ? = 100
  30. 30.40 + ? = 100
  31. 31.8 + ? = 10
  32. 32.33 + ? = 100
  33. 33.81 + ? = 100
  34. 34.17 + ? = 100
  35. 35.18 + ? = 100
  36. 36.39 + ? = 100
  37. 37.41 + ? = 100
  38. 38.58 + ? = 100
  39. 39.66 + ? = 100
  40. 40.25 + ? = 100

Answer key

  1. 1
  2. 7
  3. 63
  4. 51
  5. 73
  6. 8
  7. 39
  8. 6
  9. 46
  10. 5
  11. 70
  12. 3
  13. 79
  14. 23
  15. 54
  16. 55
  17. 66
  18. 12
  19. 52
  20. 49
  21. 29
  22. 69
  23. 48
  24. 57
  25. 9
  26. 72
  27. 4
  28. 27
  29. 84
  30. 60
  31. 2
  32. 67
  33. 19
  34. 83
  35. 82
  36. 61
  37. 59
  38. 42
  39. 34
  40. 75

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