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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 376 · 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. 1.34 + ? = 100
  2. 2.37 + ? = 100
  3. 3.2 + ? = 10
  4. 4.12 + ? = 100
  5. 5.1 + ? = 10
  6. 6.22 + ? = 100
  7. 7.77 + ? = 100
  8. 8.3 + ? = 10
  9. 9.66 + ? = 100
  10. 10.21 + ? = 100
  11. 11.8 + ? = 10
  12. 12.82 + ? = 100
  13. 13.45 + ? = 100
  14. 14.27 + ? = 100
  15. 15.9 + ? = 10
  16. 16.48 + ? = 100
  17. 17.28 + ? = 100
  18. 18.40 + ? = 100
  19. 19.55 + ? = 100
  20. 20.75 + ? = 100
  21. 21.70 + ? = 100
  22. 22.69 + ? = 100
  23. 23.89 + ? = 100
  24. 24.64 + ? = 100
  25. 25.46 + ? = 100
  26. 26.59 + ? = 100
  27. 27.4 + ? = 10
  28. 28.62 + ? = 100
  29. 29.30 + ? = 100
  30. 30.43 + ? = 100
  31. 31.14 + ? = 100
  32. 32.83 + ? = 100
  33. 33.11 + ? = 100
  34. 34.7 + ? = 10
  35. 35.19 + ? = 100
  36. 36.44 + ? = 100
  37. 37.29 + ? = 100
  38. 38.6 + ? = 10
  39. 39.36 + ? = 100
  40. 40.5 + ? = 10

Answer key

  1. 66
  2. 63
  3. 8
  4. 88
  5. 9
  6. 78
  7. 23
  8. 7
  9. 34
  10. 79
  11. 2
  12. 18
  13. 55
  14. 73
  15. 1
  16. 52
  17. 72
  18. 60
  19. 45
  20. 25
  21. 30
  22. 31
  23. 11
  24. 36
  25. 54
  26. 41
  27. 6
  28. 38
  29. 70
  30. 57
  31. 86
  32. 17
  33. 89
  34. 3
  35. 81
  36. 56
  37. 71
  38. 4
  39. 64
  40. 5

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