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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 781 · 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. 2.1 + ? = 10
  3. 3.60 + ? = 100
  4. 4.77 + ? = 100
  5. 5.9 + ? = 10
  6. 6.31 + ? = 100
  7. 7.42 + ? = 100
  8. 8.78 + ? = 100
  9. 9.62 + ? = 100
  10. 10.26 + ? = 100
  11. 11.47 + ? = 100
  12. 12.6 + ? = 10
  13. 13.55 + ? = 100
  14. 14.75 + ? = 100
  15. 15.40 + ? = 100
  16. 16.80 + ? = 100
  17. 17.8 + ? = 10
  18. 18.2 + ? = 10
  19. 19.38 + ? = 100
  20. 20.86 + ? = 100
  21. 21.3 + ? = 10
  22. 22.17 + ? = 100
  23. 23.39 + ? = 100
  24. 24.21 + ? = 100
  25. 25.87 + ? = 100
  26. 26.4 + ? = 10
  27. 27.20 + ? = 100
  28. 28.34 + ? = 100
  29. 29.7 + ? = 10
  30. 30.27 + ? = 100
  31. 31.61 + ? = 100
  32. 32.5 + ? = 10
  33. 33.72 + ? = 100
  34. 34.15 + ? = 100
  35. 35.89 + ? = 100
  36. 36.84 + ? = 100
  37. 37.33 + ? = 100
  38. 38.50 + ? = 100
  39. 39.45 + ? = 100
  40. 40.16 + ? = 100

Answer key

  1. 43
  2. 9
  3. 40
  4. 23
  5. 1
  6. 69
  7. 58
  8. 22
  9. 38
  10. 74
  11. 53
  12. 4
  13. 45
  14. 25
  15. 60
  16. 20
  17. 2
  18. 8
  19. 62
  20. 14
  21. 7
  22. 83
  23. 61
  24. 79
  25. 13
  26. 6
  27. 80
  28. 66
  29. 3
  30. 73
  31. 39
  32. 5
  33. 28
  34. 85
  35. 11
  36. 16
  37. 67
  38. 50
  39. 55
  40. 84

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