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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 48 · 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. 1.25 + ? = 100
  2. 2.26 + ? = 100
  3. 3.81 + ? = 100
  4. 4.52 + ? = 100
  5. 5.3 + ? = 10
  6. 6.29 + ? = 100
  7. 7.7 + ? = 10
  8. 8.2 + ? = 10
  9. 9.1 + ? = 10
  10. 10.6 + ? = 10
  11. 11.40 + ? = 100
  12. 12.33 + ? = 100
  13. 13.75 + ? = 100
  14. 14.34 + ? = 100
  15. 15.77 + ? = 100
  16. 16.89 + ? = 100
  17. 17.38 + ? = 100
  18. 18.5 + ? = 10
  19. 19.79 + ? = 100
  20. 20.15 + ? = 100
  21. 21.67 + ? = 100
  22. 22.13 + ? = 100
  23. 23.86 + ? = 100
  24. 24.71 + ? = 100
  25. 25.43 + ? = 100
  26. 26.12 + ? = 100
  27. 27.14 + ? = 100
  28. 28.84 + ? = 100
  29. 29.61 + ? = 100
  30. 30.30 + ? = 100
  31. 31.69 + ? = 100
  32. 32.56 + ? = 100
  33. 33.4 + ? = 10
  34. 34.8 + ? = 10
  35. 35.22 + ? = 100
  36. 36.46 + ? = 100
  37. 37.62 + ? = 100
  38. 38.60 + ? = 100
  39. 39.76 + ? = 100
  40. 40.64 + ? = 100

Answer key

  1. 75
  2. 74
  3. 19
  4. 48
  5. 7
  6. 71
  7. 3
  8. 8
  9. 9
  10. 4
  11. 60
  12. 67
  13. 25
  14. 66
  15. 23
  16. 11
  17. 62
  18. 5
  19. 21
  20. 85
  21. 33
  22. 87
  23. 14
  24. 29
  25. 57
  26. 88
  27. 86
  28. 16
  29. 39
  30. 70
  31. 31
  32. 44
  33. 6
  34. 2
  35. 78
  36. 54
  37. 38
  38. 40
  39. 24
  40. 36

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