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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 810 · 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. 1.40 + ? = 100
  2. 2.83 + ? = 100
  3. 3.41 + ? = 100
  4. 4.86 + ? = 100
  5. 5.8 + ? = 10
  6. 6.1 + ? = 10
  7. 7.50 + ? = 100
  8. 8.2 + ? = 10
  9. 9.12 + ? = 100
  10. 10.4 + ? = 10
  11. 11.62 + ? = 100
  12. 12.7 + ? = 10
  13. 13.3 + ? = 10
  14. 14.71 + ? = 100
  15. 15.43 + ? = 100
  16. 16.63 + ? = 100
  17. 17.49 + ? = 100
  18. 18.45 + ? = 100
  19. 19.89 + ? = 100
  20. 20.65 + ? = 100
  21. 21.46 + ? = 100
  22. 22.15 + ? = 100
  23. 23.67 + ? = 100
  24. 24.23 + ? = 100
  25. 25.5 + ? = 10
  26. 26.37 + ? = 100
  27. 27.87 + ? = 100
  28. 28.31 + ? = 100
  29. 29.85 + ? = 100
  30. 30.13 + ? = 100
  31. 31.66 + ? = 100
  32. 32.54 + ? = 100
  33. 33.68 + ? = 100
  34. 34.6 + ? = 10
  35. 35.9 + ? = 10
  36. 36.35 + ? = 100
  37. 37.25 + ? = 100
  38. 38.55 + ? = 100
  39. 39.60 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 60
  2. 17
  3. 59
  4. 14
  5. 2
  6. 9
  7. 50
  8. 8
  9. 88
  10. 6
  11. 38
  12. 3
  13. 7
  14. 29
  15. 57
  16. 37
  17. 51
  18. 55
  19. 11
  20. 35
  21. 54
  22. 85
  23. 33
  24. 77
  25. 5
  26. 63
  27. 13
  28. 69
  29. 15
  30. 87
  31. 34
  32. 46
  33. 32
  34. 4
  35. 1
  36. 65
  37. 75
  38. 45
  39. 40
  40. 66

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