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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 811 · 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. 1.51 + ? = 100
  2. 2.5 + ? = 10
  3. 3.58 + ? = 100
  4. 4.4 + ? = 10
  5. 5.25 + ? = 100
  6. 6.6 + ? = 10
  7. 7.2 + ? = 10
  8. 8.61 + ? = 100
  9. 9.22 + ? = 100
  10. 10.76 + ? = 100
  11. 11.59 + ? = 100
  12. 12.7 + ? = 10
  13. 13.78 + ? = 100
  14. 14.56 + ? = 100
  15. 15.9 + ? = 10
  16. 16.21 + ? = 100
  17. 17.11 + ? = 100
  18. 18.64 + ? = 100
  19. 19.32 + ? = 100
  20. 20.60 + ? = 100
  21. 21.37 + ? = 100
  22. 22.57 + ? = 100
  23. 23.33 + ? = 100
  24. 24.45 + ? = 100
  25. 25.28 + ? = 100
  26. 26.16 + ? = 100
  27. 27.8 + ? = 10
  28. 28.1 + ? = 10
  29. 29.43 + ? = 100
  30. 30.18 + ? = 100
  31. 31.54 + ? = 100
  32. 32.71 + ? = 100
  33. 33.62 + ? = 100
  34. 34.67 + ? = 100
  35. 35.12 + ? = 100
  36. 36.20 + ? = 100
  37. 37.3 + ? = 10
  38. 38.36 + ? = 100
  39. 39.89 + ? = 100
  40. 40.82 + ? = 100

Answer key

  1. 49
  2. 5
  3. 42
  4. 6
  5. 75
  6. 4
  7. 8
  8. 39
  9. 78
  10. 24
  11. 41
  12. 3
  13. 22
  14. 44
  15. 1
  16. 79
  17. 89
  18. 36
  19. 68
  20. 40
  21. 63
  22. 43
  23. 67
  24. 55
  25. 72
  26. 84
  27. 2
  28. 9
  29. 57
  30. 82
  31. 46
  32. 29
  33. 38
  34. 33
  35. 88
  36. 80
  37. 7
  38. 64
  39. 11
  40. 18

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