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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 910 · 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. 2.15 + ? = 100
  3. 3.3 + ? = 10
  4. 4.6 + ? = 10
  5. 5.2 + ? = 10
  6. 6.16 + ? = 100
  7. 7.63 + ? = 100
  8. 8.64 + ? = 100
  9. 9.4 + ? = 10
  10. 10.9 + ? = 10
  11. 11.5 + ? = 10
  12. 12.1 + ? = 10
  13. 13.68 + ? = 100
  14. 14.25 + ? = 100
  15. 15.35 + ? = 100
  16. 16.80 + ? = 100
  17. 17.39 + ? = 100
  18. 18.70 + ? = 100
  19. 19.20 + ? = 100
  20. 20.29 + ? = 100
  21. 21.37 + ? = 100
  22. 22.59 + ? = 100
  23. 23.75 + ? = 100
  24. 24.22 + ? = 100
  25. 25.55 + ? = 100
  26. 26.52 + ? = 100
  27. 27.62 + ? = 100
  28. 28.69 + ? = 100
  29. 29.7 + ? = 10
  30. 30.73 + ? = 100
  31. 31.12 + ? = 100
  32. 32.32 + ? = 100
  33. 33.86 + ? = 100
  34. 34.28 + ? = 100
  35. 35.82 + ? = 100
  36. 36.74 + ? = 100
  37. 37.48 + ? = 100
  38. 38.51 + ? = 100
  39. 39.88 + ? = 100
  40. 40.17 + ? = 100

Answer key

  1. 2
  2. 85
  3. 7
  4. 4
  5. 8
  6. 84
  7. 37
  8. 36
  9. 6
  10. 1
  11. 5
  12. 9
  13. 32
  14. 75
  15. 65
  16. 20
  17. 61
  18. 30
  19. 80
  20. 71
  21. 63
  22. 41
  23. 25
  24. 78
  25. 45
  26. 48
  27. 38
  28. 31
  29. 3
  30. 27
  31. 88
  32. 68
  33. 14
  34. 72
  35. 18
  36. 26
  37. 52
  38. 49
  39. 12
  40. 83

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