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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 719 · 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. 2.5 + ? = 10
  3. 3.1 + ? = 10
  4. 4.73 + ? = 100
  5. 5.9 + ? = 10
  6. 6.11 + ? = 100
  7. 7.20 + ? = 100
  8. 8.3 + ? = 10
  9. 9.2 + ? = 10
  10. 10.6 + ? = 10
  11. 11.7 + ? = 10
  12. 12.21 + ? = 100
  13. 13.67 + ? = 100
  14. 14.23 + ? = 100
  15. 15.77 + ? = 100
  16. 16.19 + ? = 100
  17. 17.54 + ? = 100
  18. 18.4 + ? = 10
  19. 19.38 + ? = 100
  20. 20.42 + ? = 100
  21. 21.29 + ? = 100
  22. 22.13 + ? = 100
  23. 23.49 + ? = 100
  24. 24.25 + ? = 100
  25. 25.82 + ? = 100
  26. 26.24 + ? = 100
  27. 27.40 + ? = 100
  28. 28.80 + ? = 100
  29. 29.56 + ? = 100
  30. 30.35 + ? = 100
  31. 31.83 + ? = 100
  32. 32.64 + ? = 100
  33. 33.85 + ? = 100
  34. 34.14 + ? = 100
  35. 35.44 + ? = 100
  36. 36.46 + ? = 100
  37. 37.30 + ? = 100
  38. 38.79 + ? = 100
  39. 39.52 + ? = 100
  40. 40.50 + ? = 100

Answer key

  1. 2
  2. 5
  3. 9
  4. 27
  5. 1
  6. 89
  7. 80
  8. 7
  9. 8
  10. 4
  11. 3
  12. 79
  13. 33
  14. 77
  15. 23
  16. 81
  17. 46
  18. 6
  19. 62
  20. 58
  21. 71
  22. 87
  23. 51
  24. 75
  25. 18
  26. 76
  27. 60
  28. 20
  29. 44
  30. 65
  31. 17
  32. 36
  33. 15
  34. 86
  35. 56
  36. 54
  37. 70
  38. 21
  39. 48
  40. 50

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