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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 516 · 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. 1.2 + ? = 10
  2. 2.22 + ? = 100
  3. 3.32 + ? = 100
  4. 4.3 + ? = 10
  5. 5.5 + ? = 10
  6. 6.33 + ? = 100
  7. 7.29 + ? = 100
  8. 8.4 + ? = 10
  9. 9.70 + ? = 100
  10. 10.64 + ? = 100
  11. 11.9 + ? = 10
  12. 12.17 + ? = 100
  13. 13.42 + ? = 100
  14. 14.1 + ? = 10
  15. 15.84 + ? = 100
  16. 16.30 + ? = 100
  17. 17.35 + ? = 100
  18. 18.8 + ? = 10
  19. 19.48 + ? = 100
  20. 20.57 + ? = 100
  21. 21.28 + ? = 100
  22. 22.24 + ? = 100
  23. 23.7 + ? = 10
  24. 24.78 + ? = 100
  25. 25.50 + ? = 100
  26. 26.53 + ? = 100
  27. 27.71 + ? = 100
  28. 28.13 + ? = 100
  29. 29.52 + ? = 100
  30. 30.81 + ? = 100
  31. 31.63 + ? = 100
  32. 32.72 + ? = 100
  33. 33.21 + ? = 100
  34. 34.34 + ? = 100
  35. 35.55 + ? = 100
  36. 36.41 + ? = 100
  37. 37.47 + ? = 100
  38. 38.6 + ? = 10
  39. 39.39 + ? = 100
  40. 40.19 + ? = 100

Answer key

  1. 8
  2. 78
  3. 68
  4. 7
  5. 5
  6. 67
  7. 71
  8. 6
  9. 30
  10. 36
  11. 1
  12. 83
  13. 58
  14. 9
  15. 16
  16. 70
  17. 65
  18. 2
  19. 52
  20. 43
  21. 72
  22. 76
  23. 3
  24. 22
  25. 50
  26. 47
  27. 29
  28. 87
  29. 48
  30. 19
  31. 37
  32. 28
  33. 79
  34. 66
  35. 45
  36. 59
  37. 53
  38. 4
  39. 61
  40. 81

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