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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 100 · 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. 1.5 + ? = 10
  2. 2.35 + ? = 100
  3. 3.21 + ? = 100
  4. 4.1 + ? = 10
  5. 5.2 + ? = 10
  6. 6.42 + ? = 100
  7. 7.20 + ? = 100
  8. 8.6 + ? = 10
  9. 9.77 + ? = 100
  10. 10.14 + ? = 100
  11. 11.66 + ? = 100
  12. 12.27 + ? = 100
  13. 13.7 + ? = 10
  14. 14.3 + ? = 10
  15. 15.79 + ? = 100
  16. 16.4 + ? = 10
  17. 17.44 + ? = 100
  18. 18.9 + ? = 10
  19. 19.86 + ? = 100
  20. 20.34 + ? = 100
  21. 21.8 + ? = 10
  22. 22.70 + ? = 100
  23. 23.50 + ? = 100
  24. 24.55 + ? = 100
  25. 25.59 + ? = 100
  26. 26.52 + ? = 100
  27. 27.64 + ? = 100
  28. 28.13 + ? = 100
  29. 29.31 + ? = 100
  30. 30.53 + ? = 100
  31. 31.30 + ? = 100
  32. 32.85 + ? = 100
  33. 33.65 + ? = 100
  34. 34.68 + ? = 100
  35. 35.29 + ? = 100
  36. 36.26 + ? = 100
  37. 37.37 + ? = 100
  38. 38.18 + ? = 100
  39. 39.17 + ? = 100
  40. 40.87 + ? = 100

Answer key

  1. 5
  2. 65
  3. 79
  4. 9
  5. 8
  6. 58
  7. 80
  8. 4
  9. 23
  10. 86
  11. 34
  12. 73
  13. 3
  14. 7
  15. 21
  16. 6
  17. 56
  18. 1
  19. 14
  20. 66
  21. 2
  22. 30
  23. 50
  24. 45
  25. 41
  26. 48
  27. 36
  28. 87
  29. 69
  30. 47
  31. 70
  32. 15
  33. 35
  34. 32
  35. 71
  36. 74
  37. 63
  38. 82
  39. 83
  40. 13

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