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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 904 · 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. 1.35 + ? = 100
  2. 2.4 + ? = 10
  3. 3.2 + ? = 10
  4. 4.20 + ? = 100
  5. 5.3 + ? = 10
  6. 6.50 + ? = 100
  7. 7.60 + ? = 100
  8. 8.8 + ? = 10
  9. 9.5 + ? = 10
  10. 10.62 + ? = 100
  11. 11.61 + ? = 100
  12. 12.25 + ? = 100
  13. 13.6 + ? = 10
  14. 14.19 + ? = 100
  15. 15.58 + ? = 100
  16. 16.7 + ? = 10
  17. 17.51 + ? = 100
  18. 18.32 + ? = 100
  19. 19.78 + ? = 100
  20. 20.66 + ? = 100
  21. 21.40 + ? = 100
  22. 22.11 + ? = 100
  23. 23.75 + ? = 100
  24. 24.29 + ? = 100
  25. 25.41 + ? = 100
  26. 26.26 + ? = 100
  27. 27.63 + ? = 100
  28. 28.85 + ? = 100
  29. 29.43 + ? = 100
  30. 30.21 + ? = 100
  31. 31.45 + ? = 100
  32. 32.56 + ? = 100
  33. 33.12 + ? = 100
  34. 34.22 + ? = 100
  35. 35.38 + ? = 100
  36. 36.9 + ? = 10
  37. 37.82 + ? = 100
  38. 38.27 + ? = 100
  39. 39.84 + ? = 100
  40. 40.16 + ? = 100

Answer key

  1. 65
  2. 6
  3. 8
  4. 80
  5. 7
  6. 50
  7. 40
  8. 2
  9. 5
  10. 38
  11. 39
  12. 75
  13. 4
  14. 81
  15. 42
  16. 3
  17. 49
  18. 68
  19. 22
  20. 34
  21. 60
  22. 89
  23. 25
  24. 71
  25. 59
  26. 74
  27. 37
  28. 15
  29. 57
  30. 79
  31. 55
  32. 44
  33. 88
  34. 78
  35. 62
  36. 1
  37. 18
  38. 73
  39. 16
  40. 84

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