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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 802 · 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. 1.75 + ? = 100
  2. 2.79 + ? = 100
  3. 3.72 + ? = 100
  4. 4.9 + ? = 10
  5. 5.19 + ? = 100
  6. 6.76 + ? = 100
  7. 7.87 + ? = 100
  8. 8.41 + ? = 100
  9. 9.2 + ? = 10
  10. 10.67 + ? = 100
  11. 11.64 + ? = 100
  12. 12.1 + ? = 10
  13. 13.61 + ? = 100
  14. 14.29 + ? = 100
  15. 15.57 + ? = 100
  16. 16.8 + ? = 10
  17. 17.4 + ? = 10
  18. 18.6 + ? = 10
  19. 19.80 + ? = 100
  20. 20.5 + ? = 10
  21. 21.56 + ? = 100
  22. 22.3 + ? = 10
  23. 23.83 + ? = 100
  24. 24.44 + ? = 100
  25. 25.73 + ? = 100
  26. 26.32 + ? = 100
  27. 27.20 + ? = 100
  28. 28.18 + ? = 100
  29. 29.30 + ? = 100
  30. 30.13 + ? = 100
  31. 31.58 + ? = 100
  32. 32.50 + ? = 100
  33. 33.69 + ? = 100
  34. 34.26 + ? = 100
  35. 35.78 + ? = 100
  36. 36.38 + ? = 100
  37. 37.27 + ? = 100
  38. 38.65 + ? = 100
  39. 39.48 + ? = 100
  40. 40.15 + ? = 100

Answer key

  1. 25
  2. 21
  3. 28
  4. 1
  5. 81
  6. 24
  7. 13
  8. 59
  9. 8
  10. 33
  11. 36
  12. 9
  13. 39
  14. 71
  15. 43
  16. 2
  17. 6
  18. 4
  19. 20
  20. 5
  21. 44
  22. 7
  23. 17
  24. 56
  25. 27
  26. 68
  27. 80
  28. 82
  29. 70
  30. 87
  31. 42
  32. 50
  33. 31
  34. 74
  35. 22
  36. 62
  37. 73
  38. 35
  39. 52
  40. 85

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