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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 805 · 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. 1.21 + ? = 100
  2. 2.78 + ? = 100
  3. 3.69 + ? = 100
  4. 4.3 + ? = 10
  5. 5.67 + ? = 100
  6. 6.48 + ? = 100
  7. 7.75 + ? = 100
  8. 8.45 + ? = 100
  9. 9.1 + ? = 10
  10. 10.9 + ? = 10
  11. 11.6 + ? = 10
  12. 12.63 + ? = 100
  13. 13.12 + ? = 100
  14. 14.49 + ? = 100
  15. 15.2 + ? = 10
  16. 16.71 + ? = 100
  17. 17.84 + ? = 100
  18. 18.4 + ? = 10
  19. 19.54 + ? = 100
  20. 20.79 + ? = 100
  21. 21.70 + ? = 100
  22. 22.37 + ? = 100
  23. 23.51 + ? = 100
  24. 24.32 + ? = 100
  25. 25.30 + ? = 100
  26. 26.36 + ? = 100
  27. 27.29 + ? = 100
  28. 28.7 + ? = 10
  29. 29.5 + ? = 10
  30. 30.8 + ? = 10
  31. 31.77 + ? = 100
  32. 32.14 + ? = 100
  33. 33.16 + ? = 100
  34. 34.40 + ? = 100
  35. 35.82 + ? = 100
  36. 36.15 + ? = 100
  37. 37.18 + ? = 100
  38. 38.25 + ? = 100
  39. 39.89 + ? = 100
  40. 40.44 + ? = 100

Answer key

  1. 79
  2. 22
  3. 31
  4. 7
  5. 33
  6. 52
  7. 25
  8. 55
  9. 9
  10. 1
  11. 4
  12. 37
  13. 88
  14. 51
  15. 8
  16. 29
  17. 16
  18. 6
  19. 46
  20. 21
  21. 30
  22. 63
  23. 49
  24. 68
  25. 70
  26. 64
  27. 71
  28. 3
  29. 5
  30. 2
  31. 23
  32. 86
  33. 84
  34. 60
  35. 18
  36. 85
  37. 82
  38. 75
  39. 11
  40. 56

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