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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 817 · 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. 1.87 + ? = 100
  2. 2.27 + ? = 100
  3. 3.34 + ? = 100
  4. 4.5 + ? = 10
  5. 5.28 + ? = 100
  6. 6.47 + ? = 100
  7. 7.9 + ? = 10
  8. 8.33 + ? = 100
  9. 9.7 + ? = 10
  10. 10.51 + ? = 100
  11. 11.4 + ? = 10
  12. 12.63 + ? = 100
  13. 13.70 + ? = 100
  14. 14.76 + ? = 100
  15. 15.2 + ? = 10
  16. 16.19 + ? = 100
  17. 17.83 + ? = 100
  18. 18.77 + ? = 100
  19. 19.1 + ? = 10
  20. 20.80 + ? = 100
  21. 21.8 + ? = 10
  22. 22.71 + ? = 100
  23. 23.73 + ? = 100
  24. 24.84 + ? = 100
  25. 25.6 + ? = 10
  26. 26.40 + ? = 100
  27. 27.37 + ? = 100
  28. 28.55 + ? = 100
  29. 29.39 + ? = 100
  30. 30.16 + ? = 100
  31. 31.42 + ? = 100
  32. 32.53 + ? = 100
  33. 33.48 + ? = 100
  34. 34.20 + ? = 100
  35. 35.15 + ? = 100
  36. 36.45 + ? = 100
  37. 37.23 + ? = 100
  38. 38.43 + ? = 100
  39. 39.31 + ? = 100
  40. 40.67 + ? = 100

Answer key

  1. 13
  2. 73
  3. 66
  4. 5
  5. 72
  6. 53
  7. 1
  8. 67
  9. 3
  10. 49
  11. 6
  12. 37
  13. 30
  14. 24
  15. 8
  16. 81
  17. 17
  18. 23
  19. 9
  20. 20
  21. 2
  22. 29
  23. 27
  24. 16
  25. 4
  26. 60
  27. 63
  28. 45
  29. 61
  30. 84
  31. 58
  32. 47
  33. 52
  34. 80
  35. 85
  36. 55
  37. 77
  38. 57
  39. 69
  40. 33

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