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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 934 · 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. 2.5 + ? = 10
  3. 3.30 + ? = 100
  4. 4.3 + ? = 10
  5. 5.28 + ? = 100
  6. 6.7 + ? = 10
  7. 7.80 + ? = 100
  8. 8.2 + ? = 10
  9. 9.6 + ? = 10
  10. 10.88 + ? = 100
  11. 11.38 + ? = 100
  12. 12.16 + ? = 100
  13. 13.89 + ? = 100
  14. 14.1 + ? = 10
  15. 15.9 + ? = 10
  16. 16.26 + ? = 100
  17. 17.4 + ? = 10
  18. 18.42 + ? = 100
  19. 19.62 + ? = 100
  20. 20.59 + ? = 100
  21. 21.25 + ? = 100
  22. 22.65 + ? = 100
  23. 23.44 + ? = 100
  24. 24.75 + ? = 100
  25. 25.76 + ? = 100
  26. 26.27 + ? = 100
  27. 27.78 + ? = 100
  28. 28.22 + ? = 100
  29. 29.14 + ? = 100
  30. 30.51 + ? = 100
  31. 31.24 + ? = 100
  32. 32.11 + ? = 100
  33. 33.79 + ? = 100
  34. 34.84 + ? = 100
  35. 35.85 + ? = 100
  36. 36.54 + ? = 100
  37. 37.53 + ? = 100
  38. 38.45 + ? = 100
  39. 39.32 + ? = 100
  40. 40.77 + ? = 100

Answer key

  1. 2
  2. 5
  3. 70
  4. 7
  5. 72
  6. 3
  7. 20
  8. 8
  9. 4
  10. 12
  11. 62
  12. 84
  13. 11
  14. 9
  15. 1
  16. 74
  17. 6
  18. 58
  19. 38
  20. 41
  21. 75
  22. 35
  23. 56
  24. 25
  25. 24
  26. 73
  27. 22
  28. 78
  29. 86
  30. 49
  31. 76
  32. 89
  33. 21
  34. 16
  35. 15
  36. 46
  37. 47
  38. 55
  39. 68
  40. 23

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