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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 500 · 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. 1.29 + ? = 100
  2. 2.80 + ? = 100
  3. 3.2 + ? = 10
  4. 4.1 + ? = 10
  5. 5.70 + ? = 100
  6. 6.39 + ? = 100
  7. 7.67 + ? = 100
  8. 8.6 + ? = 10
  9. 9.20 + ? = 100
  10. 10.66 + ? = 100
  11. 11.3 + ? = 10
  12. 12.17 + ? = 100
  13. 13.55 + ? = 100
  14. 14.33 + ? = 100
  15. 15.7 + ? = 10
  16. 16.87 + ? = 100
  17. 17.47 + ? = 100
  18. 18.9 + ? = 10
  19. 19.34 + ? = 100
  20. 20.60 + ? = 100
  21. 21.46 + ? = 100
  22. 22.68 + ? = 100
  23. 23.35 + ? = 100
  24. 24.84 + ? = 100
  25. 25.4 + ? = 10
  26. 26.5 + ? = 10
  27. 27.43 + ? = 100
  28. 28.49 + ? = 100
  29. 29.8 + ? = 10
  30. 30.52 + ? = 100
  31. 31.31 + ? = 100
  32. 32.16 + ? = 100
  33. 33.41 + ? = 100
  34. 34.25 + ? = 100
  35. 35.77 + ? = 100
  36. 36.27 + ? = 100
  37. 37.50 + ? = 100
  38. 38.85 + ? = 100
  39. 39.48 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 71
  2. 20
  3. 8
  4. 9
  5. 30
  6. 61
  7. 33
  8. 4
  9. 80
  10. 34
  11. 7
  12. 83
  13. 45
  14. 67
  15. 3
  16. 13
  17. 53
  18. 1
  19. 66
  20. 40
  21. 54
  22. 32
  23. 65
  24. 16
  25. 6
  26. 5
  27. 57
  28. 51
  29. 2
  30. 48
  31. 69
  32. 84
  33. 59
  34. 75
  35. 23
  36. 73
  37. 50
  38. 15
  39. 52
  40. 87

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