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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 998 · 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. 1.69 + ? = 100
  2. 2.4 + ? = 10
  3. 3.2 + ? = 10
  4. 4.55 + ? = 100
  5. 5.5 + ? = 10
  6. 6.1 + ? = 10
  7. 7.11 + ? = 100
  8. 8.87 + ? = 100
  9. 9.46 + ? = 100
  10. 10.51 + ? = 100
  11. 11.29 + ? = 100
  12. 12.81 + ? = 100
  13. 13.83 + ? = 100
  14. 14.8 + ? = 10
  15. 15.50 + ? = 100
  16. 16.9 + ? = 10
  17. 17.7 + ? = 10
  18. 18.3 + ? = 10
  19. 19.66 + ? = 100
  20. 20.85 + ? = 100
  21. 21.42 + ? = 100
  22. 22.15 + ? = 100
  23. 23.73 + ? = 100
  24. 24.49 + ? = 100
  25. 25.19 + ? = 100
  26. 26.23 + ? = 100
  27. 27.25 + ? = 100
  28. 28.6 + ? = 10
  29. 29.40 + ? = 100
  30. 30.54 + ? = 100
  31. 31.80 + ? = 100
  32. 32.64 + ? = 100
  33. 33.48 + ? = 100
  34. 34.86 + ? = 100
  35. 35.77 + ? = 100
  36. 36.62 + ? = 100
  37. 37.12 + ? = 100
  38. 38.75 + ? = 100
  39. 39.44 + ? = 100
  40. 40.88 + ? = 100

Answer key

  1. 31
  2. 6
  3. 8
  4. 45
  5. 5
  6. 9
  7. 89
  8. 13
  9. 54
  10. 49
  11. 71
  12. 19
  13. 17
  14. 2
  15. 50
  16. 1
  17. 3
  18. 7
  19. 34
  20. 15
  21. 58
  22. 85
  23. 27
  24. 51
  25. 81
  26. 77
  27. 75
  28. 4
  29. 60
  30. 46
  31. 20
  32. 36
  33. 52
  34. 14
  35. 23
  36. 38
  37. 88
  38. 25
  39. 56
  40. 12

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