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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 142 · 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. 2.3 + ? = 10
  3. 3.23 + ? = 100
  4. 4.52 + ? = 100
  5. 5.2 + ? = 10
  6. 6.8 + ? = 10
  7. 7.31 + ? = 100
  8. 8.39 + ? = 100
  9. 9.74 + ? = 100
  10. 10.7 + ? = 10
  11. 11.44 + ? = 100
  12. 12.6 + ? = 10
  13. 13.28 + ? = 100
  14. 14.15 + ? = 100
  15. 15.47 + ? = 100
  16. 16.83 + ? = 100
  17. 17.4 + ? = 10
  18. 18.56 + ? = 100
  19. 19.1 + ? = 10
  20. 20.71 + ? = 100
  21. 21.73 + ? = 100
  22. 22.5 + ? = 10
  23. 23.84 + ? = 100
  24. 24.50 + ? = 100
  25. 25.37 + ? = 100
  26. 26.59 + ? = 100
  27. 27.77 + ? = 100
  28. 28.26 + ? = 100
  29. 29.89 + ? = 100
  30. 30.67 + ? = 100
  31. 31.86 + ? = 100
  32. 32.20 + ? = 100
  33. 33.38 + ? = 100
  34. 34.32 + ? = 100
  35. 35.88 + ? = 100
  36. 36.53 + ? = 100
  37. 37.12 + ? = 100
  38. 38.24 + ? = 100
  39. 39.63 + ? = 100
  40. 40.85 + ? = 100

Answer key

  1. 21
  2. 7
  3. 77
  4. 48
  5. 8
  6. 2
  7. 69
  8. 61
  9. 26
  10. 3
  11. 56
  12. 4
  13. 72
  14. 85
  15. 53
  16. 17
  17. 6
  18. 44
  19. 9
  20. 29
  21. 27
  22. 5
  23. 16
  24. 50
  25. 63
  26. 41
  27. 23
  28. 74
  29. 11
  30. 33
  31. 14
  32. 80
  33. 62
  34. 68
  35. 12
  36. 47
  37. 88
  38. 76
  39. 37
  40. 15

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