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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 726 · 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. 1.3 + ? = 10
  2. 2.6 + ? = 10
  3. 3.44 + ? = 100
  4. 4.1 + ? = 10
  5. 5.13 + ? = 100
  6. 6.7 + ? = 10
  7. 7.73 + ? = 100
  8. 8.8 + ? = 10
  9. 9.5 + ? = 10
  10. 10.79 + ? = 100
  11. 11.12 + ? = 100
  12. 12.87 + ? = 100
  13. 13.42 + ? = 100
  14. 14.2 + ? = 10
  15. 15.36 + ? = 100
  16. 16.15 + ? = 100
  17. 17.80 + ? = 100
  18. 18.18 + ? = 100
  19. 19.32 + ? = 100
  20. 20.82 + ? = 100
  21. 21.9 + ? = 10
  22. 22.50 + ? = 100
  23. 23.61 + ? = 100
  24. 24.54 + ? = 100
  25. 25.52 + ? = 100
  26. 26.57 + ? = 100
  27. 27.25 + ? = 100
  28. 28.27 + ? = 100
  29. 29.33 + ? = 100
  30. 30.69 + ? = 100
  31. 31.34 + ? = 100
  32. 32.72 + ? = 100
  33. 33.4 + ? = 10
  34. 34.43 + ? = 100
  35. 35.22 + ? = 100
  36. 36.41 + ? = 100
  37. 37.49 + ? = 100
  38. 38.48 + ? = 100
  39. 39.35 + ? = 100
  40. 40.88 + ? = 100

Answer key

  1. 7
  2. 4
  3. 56
  4. 9
  5. 87
  6. 3
  7. 27
  8. 2
  9. 5
  10. 21
  11. 88
  12. 13
  13. 58
  14. 8
  15. 64
  16. 85
  17. 20
  18. 82
  19. 68
  20. 18
  21. 1
  22. 50
  23. 39
  24. 46
  25. 48
  26. 43
  27. 75
  28. 73
  29. 67
  30. 31
  31. 66
  32. 28
  33. 6
  34. 57
  35. 78
  36. 59
  37. 51
  38. 52
  39. 65
  40. 12

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