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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 814 · 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. 1.25 + ? = 100
  2. 2.29 + ? = 100
  3. 3.22 + ? = 100
  4. 4.4 + ? = 10
  5. 5.59 + ? = 100
  6. 6.42 + ? = 100
  7. 7.61 + ? = 100
  8. 8.9 + ? = 10
  9. 9.60 + ? = 100
  10. 10.76 + ? = 100
  11. 11.2 + ? = 10
  12. 12.78 + ? = 100
  13. 13.67 + ? = 100
  14. 14.6 + ? = 10
  15. 15.34 + ? = 100
  16. 16.7 + ? = 10
  17. 17.62 + ? = 100
  18. 18.88 + ? = 100
  19. 19.53 + ? = 100
  20. 20.3 + ? = 10
  21. 21.44 + ? = 100
  22. 22.1 + ? = 10
  23. 23.33 + ? = 100
  24. 24.12 + ? = 100
  25. 25.23 + ? = 100
  26. 26.69 + ? = 100
  27. 27.80 + ? = 100
  28. 28.5 + ? = 10
  29. 29.82 + ? = 100
  30. 30.39 + ? = 100
  31. 31.19 + ? = 100
  32. 32.38 + ? = 100
  33. 33.68 + ? = 100
  34. 34.84 + ? = 100
  35. 35.65 + ? = 100
  36. 36.20 + ? = 100
  37. 37.48 + ? = 100
  38. 38.8 + ? = 10
  39. 39.63 + ? = 100
  40. 40.89 + ? = 100

Answer key

  1. 75
  2. 71
  3. 78
  4. 6
  5. 41
  6. 58
  7. 39
  8. 1
  9. 40
  10. 24
  11. 8
  12. 22
  13. 33
  14. 4
  15. 66
  16. 3
  17. 38
  18. 12
  19. 47
  20. 7
  21. 56
  22. 9
  23. 67
  24. 88
  25. 77
  26. 31
  27. 20
  28. 5
  29. 18
  30. 61
  31. 81
  32. 62
  33. 32
  34. 16
  35. 35
  36. 80
  37. 52
  38. 2
  39. 37
  40. 11

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