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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 943 · 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. 1.21 + ? = 100
  2. 2.78 + ? = 100
  3. 3.2 + ? = 10
  4. 4.27 + ? = 100
  5. 5.1 + ? = 10
  6. 6.5 + ? = 10
  7. 7.4 + ? = 10
  8. 8.20 + ? = 100
  9. 9.30 + ? = 100
  10. 10.9 + ? = 10
  11. 11.58 + ? = 100
  12. 12.3 + ? = 10
  13. 13.46 + ? = 100
  14. 14.25 + ? = 100
  15. 15.79 + ? = 100
  16. 16.19 + ? = 100
  17. 17.16 + ? = 100
  18. 18.6 + ? = 10
  19. 19.69 + ? = 100
  20. 20.18 + ? = 100
  21. 21.7 + ? = 10
  22. 22.60 + ? = 100
  23. 23.76 + ? = 100
  24. 24.43 + ? = 100
  25. 25.61 + ? = 100
  26. 26.45 + ? = 100
  27. 27.32 + ? = 100
  28. 28.53 + ? = 100
  29. 29.65 + ? = 100
  30. 30.81 + ? = 100
  31. 31.87 + ? = 100
  32. 32.62 + ? = 100
  33. 33.40 + ? = 100
  34. 34.17 + ? = 100
  35. 35.29 + ? = 100
  36. 36.8 + ? = 10
  37. 37.71 + ? = 100
  38. 38.72 + ? = 100
  39. 39.89 + ? = 100
  40. 40.54 + ? = 100

Answer key

  1. 79
  2. 22
  3. 8
  4. 73
  5. 9
  6. 5
  7. 6
  8. 80
  9. 70
  10. 1
  11. 42
  12. 7
  13. 54
  14. 75
  15. 21
  16. 81
  17. 84
  18. 4
  19. 31
  20. 82
  21. 3
  22. 40
  23. 24
  24. 57
  25. 39
  26. 55
  27. 68
  28. 47
  29. 35
  30. 19
  31. 13
  32. 38
  33. 60
  34. 83
  35. 71
  36. 2
  37. 29
  38. 28
  39. 11
  40. 46

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