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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 550 · 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. 1.79 + ? = 100
  2. 2.89 + ? = 100
  3. 3.50 + ? = 100
  4. 4.77 + ? = 100
  5. 5.3 + ? = 10
  6. 6.25 + ? = 100
  7. 7.5 + ? = 10
  8. 8.80 + ? = 100
  9. 9.86 + ? = 100
  10. 10.1 + ? = 10
  11. 11.7 + ? = 10
  12. 12.4 + ? = 10
  13. 13.2 + ? = 10
  14. 14.13 + ? = 100
  15. 15.56 + ? = 100
  16. 16.8 + ? = 10
  17. 17.87 + ? = 100
  18. 18.9 + ? = 10
  19. 19.38 + ? = 100
  20. 20.6 + ? = 10
  21. 21.35 + ? = 100
  22. 22.59 + ? = 100
  23. 23.70 + ? = 100
  24. 24.18 + ? = 100
  25. 25.33 + ? = 100
  26. 26.48 + ? = 100
  27. 27.28 + ? = 100
  28. 28.32 + ? = 100
  29. 29.29 + ? = 100
  30. 30.22 + ? = 100
  31. 31.84 + ? = 100
  32. 32.53 + ? = 100
  33. 33.81 + ? = 100
  34. 34.62 + ? = 100
  35. 35.65 + ? = 100
  36. 36.73 + ? = 100
  37. 37.24 + ? = 100
  38. 38.40 + ? = 100
  39. 39.45 + ? = 100
  40. 40.26 + ? = 100

Answer key

  1. 21
  2. 11
  3. 50
  4. 23
  5. 7
  6. 75
  7. 5
  8. 20
  9. 14
  10. 9
  11. 3
  12. 6
  13. 8
  14. 87
  15. 44
  16. 2
  17. 13
  18. 1
  19. 62
  20. 4
  21. 65
  22. 41
  23. 30
  24. 82
  25. 67
  26. 52
  27. 72
  28. 68
  29. 71
  30. 78
  31. 16
  32. 47
  33. 19
  34. 38
  35. 35
  36. 27
  37. 76
  38. 60
  39. 55
  40. 74

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