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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 898 · 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. 2.25 + ? = 100
  3. 3.5 + ? = 10
  4. 4.52 + ? = 100
  5. 5.9 + ? = 10
  6. 6.79 + ? = 100
  7. 7.4 + ? = 10
  8. 8.6 + ? = 10
  9. 9.85 + ? = 100
  10. 10.64 + ? = 100
  11. 11.3 + ? = 10
  12. 12.63 + ? = 100
  13. 13.38 + ? = 100
  14. 14.7 + ? = 10
  15. 15.67 + ? = 100
  16. 16.19 + ? = 100
  17. 17.32 + ? = 100
  18. 18.71 + ? = 100
  19. 19.15 + ? = 100
  20. 20.8 + ? = 10
  21. 21.12 + ? = 100
  22. 22.74 + ? = 100
  23. 23.16 + ? = 100
  24. 24.55 + ? = 100
  25. 25.58 + ? = 100
  26. 26.2 + ? = 10
  27. 27.80 + ? = 100
  28. 28.31 + ? = 100
  29. 29.69 + ? = 100
  30. 30.73 + ? = 100
  31. 31.29 + ? = 100
  32. 32.22 + ? = 100
  33. 33.20 + ? = 100
  34. 34.1 + ? = 10
  35. 35.56 + ? = 100
  36. 36.81 + ? = 100
  37. 37.75 + ? = 100
  38. 38.24 + ? = 100
  39. 39.78 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 43
  2. 75
  3. 5
  4. 48
  5. 1
  6. 21
  7. 6
  8. 4
  9. 15
  10. 36
  11. 7
  12. 37
  13. 62
  14. 3
  15. 33
  16. 81
  17. 68
  18. 29
  19. 85
  20. 2
  21. 88
  22. 26
  23. 84
  24. 45
  25. 42
  26. 8
  27. 20
  28. 69
  29. 31
  30. 27
  31. 71
  32. 78
  33. 80
  34. 9
  35. 44
  36. 19
  37. 25
  38. 76
  39. 22
  40. 66

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