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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 251 · 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. 1.66 + ? = 100
  2. 2.33 + ? = 100
  3. 3.2 + ? = 10
  4. 4.56 + ? = 100
  5. 5.19 + ? = 100
  6. 6.34 + ? = 100
  7. 7.4 + ? = 10
  8. 8.9 + ? = 10
  9. 9.61 + ? = 100
  10. 10.60 + ? = 100
  11. 11.68 + ? = 100
  12. 12.20 + ? = 100
  13. 13.44 + ? = 100
  14. 14.8 + ? = 10
  15. 15.76 + ? = 100
  16. 16.79 + ? = 100
  17. 17.5 + ? = 10
  18. 18.1 + ? = 10
  19. 19.6 + ? = 10
  20. 20.24 + ? = 100
  21. 21.7 + ? = 10
  22. 22.65 + ? = 100
  23. 23.23 + ? = 100
  24. 24.47 + ? = 100
  25. 25.3 + ? = 10
  26. 26.86 + ? = 100
  27. 27.71 + ? = 100
  28. 28.88 + ? = 100
  29. 29.13 + ? = 100
  30. 30.87 + ? = 100
  31. 31.12 + ? = 100
  32. 32.81 + ? = 100
  33. 33.62 + ? = 100
  34. 34.85 + ? = 100
  35. 35.78 + ? = 100
  36. 36.75 + ? = 100
  37. 37.82 + ? = 100
  38. 38.38 + ? = 100
  39. 39.77 + ? = 100
  40. 40.52 + ? = 100

Answer key

  1. 34
  2. 67
  3. 8
  4. 44
  5. 81
  6. 66
  7. 6
  8. 1
  9. 39
  10. 40
  11. 32
  12. 80
  13. 56
  14. 2
  15. 24
  16. 21
  17. 5
  18. 9
  19. 4
  20. 76
  21. 3
  22. 35
  23. 77
  24. 53
  25. 7
  26. 14
  27. 29
  28. 12
  29. 87
  30. 13
  31. 88
  32. 19
  33. 38
  34. 15
  35. 22
  36. 25
  37. 18
  38. 62
  39. 23
  40. 48

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