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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 997 · 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. 2.9 + ? = 10
  3. 3.5 + ? = 10
  4. 4.39 + ? = 100
  5. 5.52 + ? = 100
  6. 6.19 + ? = 100
  7. 7.12 + ? = 100
  8. 8.6 + ? = 10
  9. 9.4 + ? = 10
  10. 10.36 + ? = 100
  11. 11.58 + ? = 100
  12. 12.13 + ? = 100
  13. 13.24 + ? = 100
  14. 14.53 + ? = 100
  15. 15.42 + ? = 100
  16. 16.17 + ? = 100
  17. 17.40 + ? = 100
  18. 18.71 + ? = 100
  19. 19.45 + ? = 100
  20. 20.30 + ? = 100
  21. 21.3 + ? = 10
  22. 22.69 + ? = 100
  23. 23.16 + ? = 100
  24. 24.29 + ? = 100
  25. 25.1 + ? = 10
  26. 26.81 + ? = 100
  27. 27.8 + ? = 10
  28. 28.26 + ? = 100
  29. 29.32 + ? = 100
  30. 30.18 + ? = 100
  31. 31.76 + ? = 100
  32. 32.7 + ? = 10
  33. 33.15 + ? = 100
  34. 34.63 + ? = 100
  35. 35.23 + ? = 100
  36. 36.72 + ? = 100
  37. 37.67 + ? = 100
  38. 38.79 + ? = 100
  39. 39.75 + ? = 100
  40. 40.87 + ? = 100

Answer key

  1. 8
  2. 1
  3. 5
  4. 61
  5. 48
  6. 81
  7. 88
  8. 4
  9. 6
  10. 64
  11. 42
  12. 87
  13. 76
  14. 47
  15. 58
  16. 83
  17. 60
  18. 29
  19. 55
  20. 70
  21. 7
  22. 31
  23. 84
  24. 71
  25. 9
  26. 19
  27. 2
  28. 74
  29. 68
  30. 82
  31. 24
  32. 3
  33. 85
  34. 37
  35. 77
  36. 28
  37. 33
  38. 21
  39. 25
  40. 13

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