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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 258 · 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. 1.58 + ? = 100
  2. 2.3 + ? = 10
  3. 3.4 + ? = 10
  4. 4.65 + ? = 100
  5. 5.14 + ? = 100
  6. 6.7 + ? = 10
  7. 7.1 + ? = 10
  8. 8.17 + ? = 100
  9. 9.21 + ? = 100
  10. 10.2 + ? = 10
  11. 11.9 + ? = 10
  12. 12.79 + ? = 100
  13. 13.60 + ? = 100
  14. 14.6 + ? = 10
  15. 15.63 + ? = 100
  16. 16.53 + ? = 100
  17. 17.15 + ? = 100
  18. 18.84 + ? = 100
  19. 19.54 + ? = 100
  20. 20.68 + ? = 100
  21. 21.89 + ? = 100
  22. 22.16 + ? = 100
  23. 23.13 + ? = 100
  24. 24.70 + ? = 100
  25. 25.50 + ? = 100
  26. 26.8 + ? = 10
  27. 27.25 + ? = 100
  28. 28.49 + ? = 100
  29. 29.5 + ? = 10
  30. 30.28 + ? = 100
  31. 31.78 + ? = 100
  32. 32.88 + ? = 100
  33. 33.22 + ? = 100
  34. 34.37 + ? = 100
  35. 35.61 + ? = 100
  36. 36.26 + ? = 100
  37. 37.85 + ? = 100
  38. 38.76 + ? = 100
  39. 39.59 + ? = 100
  40. 40.62 + ? = 100

Answer key

  1. 42
  2. 7
  3. 6
  4. 35
  5. 86
  6. 3
  7. 9
  8. 83
  9. 79
  10. 8
  11. 1
  12. 21
  13. 40
  14. 4
  15. 37
  16. 47
  17. 85
  18. 16
  19. 46
  20. 32
  21. 11
  22. 84
  23. 87
  24. 30
  25. 50
  26. 2
  27. 75
  28. 51
  29. 5
  30. 72
  31. 22
  32. 12
  33. 78
  34. 63
  35. 39
  36. 74
  37. 15
  38. 24
  39. 41
  40. 38

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