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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 586 · 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. 1.32 + ? = 100
  2. 2.80 + ? = 100
  3. 3.16 + ? = 100
  4. 4.57 + ? = 100
  5. 5.25 + ? = 100
  6. 6.42 + ? = 100
  7. 7.61 + ? = 100
  8. 8.4 + ? = 10
  9. 9.78 + ? = 100
  10. 10.73 + ? = 100
  11. 11.38 + ? = 100
  12. 12.77 + ? = 100
  13. 13.12 + ? = 100
  14. 14.41 + ? = 100
  15. 15.9 + ? = 10
  16. 16.67 + ? = 100
  17. 17.70 + ? = 100
  18. 18.39 + ? = 100
  19. 19.7 + ? = 10
  20. 20.40 + ? = 100
  21. 21.2 + ? = 10
  22. 22.3 + ? = 10
  23. 23.8 + ? = 10
  24. 24.75 + ? = 100
  25. 25.21 + ? = 100
  26. 26.82 + ? = 100
  27. 27.35 + ? = 100
  28. 28.26 + ? = 100
  29. 29.85 + ? = 100
  30. 30.49 + ? = 100
  31. 31.1 + ? = 10
  32. 32.6 + ? = 10
  33. 33.20 + ? = 100
  34. 34.59 + ? = 100
  35. 35.79 + ? = 100
  36. 36.52 + ? = 100
  37. 37.58 + ? = 100
  38. 38.30 + ? = 100
  39. 39.76 + ? = 100
  40. 40.17 + ? = 100

Answer key

  1. 68
  2. 20
  3. 84
  4. 43
  5. 75
  6. 58
  7. 39
  8. 6
  9. 22
  10. 27
  11. 62
  12. 23
  13. 88
  14. 59
  15. 1
  16. 33
  17. 30
  18. 61
  19. 3
  20. 60
  21. 8
  22. 7
  23. 2
  24. 25
  25. 79
  26. 18
  27. 65
  28. 74
  29. 15
  30. 51
  31. 9
  32. 4
  33. 80
  34. 41
  35. 21
  36. 48
  37. 42
  38. 70
  39. 24
  40. 83

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