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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 762 · 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. 1.39 + ? = 100
  2. 2.23 + ? = 100
  3. 3.52 + ? = 100
  4. 4.72 + ? = 100
  5. 5.15 + ? = 100
  6. 6.9 + ? = 10
  7. 7.7 + ? = 10
  8. 8.1 + ? = 10
  9. 9.65 + ? = 100
  10. 10.77 + ? = 100
  11. 11.35 + ? = 100
  12. 12.4 + ? = 10
  13. 13.80 + ? = 100
  14. 14.62 + ? = 100
  15. 15.2 + ? = 10
  16. 16.19 + ? = 100
  17. 17.8 + ? = 10
  18. 18.26 + ? = 100
  19. 19.86 + ? = 100
  20. 20.74 + ? = 100
  21. 21.27 + ? = 100
  22. 22.85 + ? = 100
  23. 23.30 + ? = 100
  24. 24.36 + ? = 100
  25. 25.6 + ? = 10
  26. 26.61 + ? = 100
  27. 27.34 + ? = 100
  28. 28.88 + ? = 100
  29. 29.67 + ? = 100
  30. 30.13 + ? = 100
  31. 31.22 + ? = 100
  32. 32.59 + ? = 100
  33. 33.82 + ? = 100
  34. 34.84 + ? = 100
  35. 35.73 + ? = 100
  36. 36.71 + ? = 100
  37. 37.63 + ? = 100
  38. 38.50 + ? = 100
  39. 39.79 + ? = 100
  40. 40.69 + ? = 100

Answer key

  1. 61
  2. 77
  3. 48
  4. 28
  5. 85
  6. 1
  7. 3
  8. 9
  9. 35
  10. 23
  11. 65
  12. 6
  13. 20
  14. 38
  15. 8
  16. 81
  17. 2
  18. 74
  19. 14
  20. 26
  21. 73
  22. 15
  23. 70
  24. 64
  25. 4
  26. 39
  27. 66
  28. 12
  29. 33
  30. 87
  31. 78
  32. 41
  33. 18
  34. 16
  35. 27
  36. 29
  37. 37
  38. 50
  39. 21
  40. 31

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