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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 924 · 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. 1.58 + ? = 100
  2. 2.41 + ? = 100
  3. 3.17 + ? = 100
  4. 4.62 + ? = 100
  5. 5.19 + ? = 100
  6. 6.9 + ? = 10
  7. 7.61 + ? = 100
  8. 8.69 + ? = 100
  9. 9.34 + ? = 100
  10. 10.21 + ? = 100
  11. 11.1 + ? = 10
  12. 12.45 + ? = 100
  13. 13.57 + ? = 100
  14. 14.87 + ? = 100
  15. 15.3 + ? = 10
  16. 16.46 + ? = 100
  17. 17.32 + ? = 100
  18. 18.13 + ? = 100
  19. 19.48 + ? = 100
  20. 20.2 + ? = 10
  21. 21.5 + ? = 10
  22. 22.67 + ? = 100
  23. 23.63 + ? = 100
  24. 24.82 + ? = 100
  25. 25.23 + ? = 100
  26. 26.81 + ? = 100
  27. 27.4 + ? = 10
  28. 28.7 + ? = 10
  29. 29.83 + ? = 100
  30. 30.76 + ? = 100
  31. 31.8 + ? = 10
  32. 32.71 + ? = 100
  33. 33.11 + ? = 100
  34. 34.78 + ? = 100
  35. 35.68 + ? = 100
  36. 36.33 + ? = 100
  37. 37.27 + ? = 100
  38. 38.6 + ? = 10
  39. 39.25 + ? = 100
  40. 40.40 + ? = 100

Answer key

  1. 42
  2. 59
  3. 83
  4. 38
  5. 81
  6. 1
  7. 39
  8. 31
  9. 66
  10. 79
  11. 9
  12. 55
  13. 43
  14. 13
  15. 7
  16. 54
  17. 68
  18. 87
  19. 52
  20. 8
  21. 5
  22. 33
  23. 37
  24. 18
  25. 77
  26. 19
  27. 6
  28. 3
  29. 17
  30. 24
  31. 2
  32. 29
  33. 89
  34. 22
  35. 32
  36. 67
  37. 73
  38. 4
  39. 75
  40. 60

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