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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 673 · 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. 1.6 + ? = 10
  2. 2.9 + ? = 10
  3. 3.5 + ? = 10
  4. 4.67 + ? = 100
  5. 5.11 + ? = 100
  6. 6.28 + ? = 100
  7. 7.4 + ? = 10
  8. 8.39 + ? = 100
  9. 9.51 + ? = 100
  10. 10.75 + ? = 100
  11. 11.1 + ? = 10
  12. 12.2 + ? = 10
  13. 13.3 + ? = 10
  14. 14.16 + ? = 100
  15. 15.29 + ? = 100
  16. 16.24 + ? = 100
  17. 17.84 + ? = 100
  18. 18.7 + ? = 10
  19. 19.43 + ? = 100
  20. 20.40 + ? = 100
  21. 21.8 + ? = 10
  22. 22.23 + ? = 100
  23. 23.12 + ? = 100
  24. 24.81 + ? = 100
  25. 25.31 + ? = 100
  26. 26.18 + ? = 100
  27. 27.34 + ? = 100
  28. 28.33 + ? = 100
  29. 29.57 + ? = 100
  30. 30.89 + ? = 100
  31. 31.50 + ? = 100
  32. 32.13 + ? = 100
  33. 33.41 + ? = 100
  34. 34.32 + ? = 100
  35. 35.36 + ? = 100
  36. 36.70 + ? = 100
  37. 37.22 + ? = 100
  38. 38.77 + ? = 100
  39. 39.19 + ? = 100
  40. 40.53 + ? = 100

Answer key

  1. 4
  2. 1
  3. 5
  4. 33
  5. 89
  6. 72
  7. 6
  8. 61
  9. 49
  10. 25
  11. 9
  12. 8
  13. 7
  14. 84
  15. 71
  16. 76
  17. 16
  18. 3
  19. 57
  20. 60
  21. 2
  22. 77
  23. 88
  24. 19
  25. 69
  26. 82
  27. 66
  28. 67
  29. 43
  30. 11
  31. 50
  32. 87
  33. 59
  34. 68
  35. 64
  36. 30
  37. 78
  38. 23
  39. 81
  40. 47

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