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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 748 · 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. 1.57 + ? = 100
  2. 2.85 + ? = 100
  3. 3.25 + ? = 100
  4. 4.1 + ? = 10
  5. 5.8 + ? = 10
  6. 6.33 + ? = 100
  7. 7.58 + ? = 100
  8. 8.27 + ? = 100
  9. 9.6 + ? = 10
  10. 10.7 + ? = 10
  11. 11.34 + ? = 100
  12. 12.52 + ? = 100
  13. 13.75 + ? = 100
  14. 14.39 + ? = 100
  15. 15.16 + ? = 100
  16. 16.89 + ? = 100
  17. 17.29 + ? = 100
  18. 18.78 + ? = 100
  19. 19.5 + ? = 10
  20. 20.2 + ? = 10
  21. 21.11 + ? = 100
  22. 22.45 + ? = 100
  23. 23.3 + ? = 10
  24. 24.88 + ? = 100
  25. 25.9 + ? = 10
  26. 26.24 + ? = 100
  27. 27.60 + ? = 100
  28. 28.26 + ? = 100
  29. 29.80 + ? = 100
  30. 30.30 + ? = 100
  31. 31.62 + ? = 100
  32. 32.20 + ? = 100
  33. 33.12 + ? = 100
  34. 34.48 + ? = 100
  35. 35.72 + ? = 100
  36. 36.61 + ? = 100
  37. 37.21 + ? = 100
  38. 38.53 + ? = 100
  39. 39.73 + ? = 100
  40. 40.13 + ? = 100

Answer key

  1. 43
  2. 15
  3. 75
  4. 9
  5. 2
  6. 67
  7. 42
  8. 73
  9. 4
  10. 3
  11. 66
  12. 48
  13. 25
  14. 61
  15. 84
  16. 11
  17. 71
  18. 22
  19. 5
  20. 8
  21. 89
  22. 55
  23. 7
  24. 12
  25. 1
  26. 76
  27. 40
  28. 74
  29. 20
  30. 70
  31. 38
  32. 80
  33. 88
  34. 52
  35. 28
  36. 39
  37. 79
  38. 47
  39. 27
  40. 87

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