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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 36 · 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. 1.7 + ? = 10
  2. 2.57 + ? = 100
  3. 3.18 + ? = 100
  4. 4.14 + ? = 100
  5. 5.53 + ? = 100
  6. 6.3 + ? = 10
  7. 7.61 + ? = 100
  8. 8.6 + ? = 10
  9. 9.84 + ? = 100
  10. 10.4 + ? = 10
  11. 11.24 + ? = 100
  12. 12.81 + ? = 100
  13. 13.9 + ? = 10
  14. 14.77 + ? = 100
  15. 15.19 + ? = 100
  16. 16.46 + ? = 100
  17. 17.68 + ? = 100
  18. 18.36 + ? = 100
  19. 19.8 + ? = 10
  20. 20.11 + ? = 100
  21. 21.34 + ? = 100
  22. 22.43 + ? = 100
  23. 23.39 + ? = 100
  24. 24.3 + ? = 10
  25. 25.25 + ? = 100
  26. 26.30 + ? = 100
  27. 27.20 + ? = 100
  28. 28.88 + ? = 100
  29. 29.21 + ? = 100
  30. 30.2 + ? = 10
  31. 31.1 + ? = 10
  32. 32.74 + ? = 100
  33. 33.17 + ? = 100
  34. 34.5 + ? = 10
  35. 35.69 + ? = 100
  36. 36.80 + ? = 100
  37. 37.40 + ? = 100
  38. 38.48 + ? = 100
  39. 39.50 + ? = 100
  40. 40.71 + ? = 100

Answer key

  1. 3
  2. 43
  3. 82
  4. 86
  5. 47
  6. 7
  7. 39
  8. 4
  9. 16
  10. 6
  11. 76
  12. 19
  13. 1
  14. 23
  15. 81
  16. 54
  17. 32
  18. 64
  19. 2
  20. 89
  21. 66
  22. 57
  23. 61
  24. 7
  25. 75
  26. 70
  27. 80
  28. 12
  29. 79
  30. 8
  31. 9
  32. 26
  33. 83
  34. 5
  35. 31
  36. 20
  37. 60
  38. 52
  39. 50
  40. 29

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