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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 721 · 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. 1.8 + ? = 10
  2. 2.48 + ? = 100
  3. 3.62 + ? = 100
  4. 4.30 + ? = 100
  5. 5.1 + ? = 10
  6. 6.25 + ? = 100
  7. 7.85 + ? = 100
  8. 8.77 + ? = 100
  9. 9.4 + ? = 10
  10. 10.83 + ? = 100
  11. 11.89 + ? = 100
  12. 12.88 + ? = 100
  13. 13.45 + ? = 100
  14. 14.50 + ? = 100
  15. 15.2 + ? = 10
  16. 16.3 + ? = 10
  17. 17.6 + ? = 10
  18. 18.47 + ? = 100
  19. 19.68 + ? = 100
  20. 20.86 + ? = 100
  21. 21.74 + ? = 100
  22. 22.78 + ? = 100
  23. 23.5 + ? = 10
  24. 24.18 + ? = 100
  25. 25.40 + ? = 100
  26. 26.9 + ? = 10
  27. 27.69 + ? = 100
  28. 28.31 + ? = 100
  29. 29.57 + ? = 100
  30. 30.39 + ? = 100
  31. 31.7 + ? = 10
  32. 32.56 + ? = 100
  33. 33.54 + ? = 100
  34. 34.87 + ? = 100
  35. 35.27 + ? = 100
  36. 36.35 + ? = 100
  37. 37.84 + ? = 100
  38. 38.21 + ? = 100
  39. 39.66 + ? = 100
  40. 40.34 + ? = 100

Answer key

  1. 2
  2. 52
  3. 38
  4. 70
  5. 9
  6. 75
  7. 15
  8. 23
  9. 6
  10. 17
  11. 11
  12. 12
  13. 55
  14. 50
  15. 8
  16. 7
  17. 4
  18. 53
  19. 32
  20. 14
  21. 26
  22. 22
  23. 5
  24. 82
  25. 60
  26. 1
  27. 31
  28. 69
  29. 43
  30. 61
  31. 3
  32. 44
  33. 46
  34. 13
  35. 73
  36. 65
  37. 16
  38. 79
  39. 34
  40. 66

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