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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 600 · 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. 1.8 + ? = 10
  2. 2.39 + ? = 100
  3. 3.5 + ? = 10
  4. 4.2 + ? = 10
  5. 5.31 + ? = 100
  6. 6.41 + ? = 100
  7. 7.43 + ? = 100
  8. 8.6 + ? = 10
  9. 9.4 + ? = 10
  10. 10.1 + ? = 10
  11. 11.49 + ? = 100
  12. 12.29 + ? = 100
  13. 13.22 + ? = 100
  14. 14.37 + ? = 100
  15. 15.7 + ? = 10
  16. 16.3 + ? = 10
  17. 17.73 + ? = 100
  18. 18.72 + ? = 100
  19. 19.66 + ? = 100
  20. 20.45 + ? = 100
  21. 21.71 + ? = 100
  22. 22.14 + ? = 100
  23. 23.81 + ? = 100
  24. 24.75 + ? = 100
  25. 25.62 + ? = 100
  26. 26.78 + ? = 100
  27. 27.9 + ? = 10
  28. 28.65 + ? = 100
  29. 29.89 + ? = 100
  30. 30.53 + ? = 100
  31. 31.54 + ? = 100
  32. 32.77 + ? = 100
  33. 33.42 + ? = 100
  34. 34.15 + ? = 100
  35. 35.23 + ? = 100
  36. 36.12 + ? = 100
  37. 37.46 + ? = 100
  38. 38.88 + ? = 100
  39. 39.80 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 2
  2. 61
  3. 5
  4. 8
  5. 69
  6. 59
  7. 57
  8. 4
  9. 6
  10. 9
  11. 51
  12. 71
  13. 78
  14. 63
  15. 3
  16. 7
  17. 27
  18. 28
  19. 34
  20. 55
  21. 29
  22. 86
  23. 19
  24. 25
  25. 38
  26. 22
  27. 1
  28. 35
  29. 11
  30. 47
  31. 46
  32. 23
  33. 58
  34. 85
  35. 77
  36. 88
  37. 54
  38. 12
  39. 20
  40. 66

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