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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 644 · 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. 1.59 + ? = 100
  2. 2.20 + ? = 100
  3. 3.49 + ? = 100
  4. 4.3 + ? = 10
  5. 5.76 + ? = 100
  6. 6.34 + ? = 100
  7. 7.36 + ? = 100
  8. 8.52 + ? = 100
  9. 9.54 + ? = 100
  10. 10.7 + ? = 10
  11. 11.37 + ? = 100
  12. 12.35 + ? = 100
  13. 13.9 + ? = 10
  14. 14.13 + ? = 100
  15. 15.43 + ? = 100
  16. 16.85 + ? = 100
  17. 17.50 + ? = 100
  18. 18.12 + ? = 100
  19. 19.6 + ? = 10
  20. 20.25 + ? = 100
  21. 21.57 + ? = 100
  22. 22.28 + ? = 100
  23. 23.88 + ? = 100
  24. 24.33 + ? = 100
  25. 25.81 + ? = 100
  26. 26.2 + ? = 10
  27. 27.1 + ? = 10
  28. 28.70 + ? = 100
  29. 29.63 + ? = 100
  30. 30.4 + ? = 10
  31. 31.65 + ? = 100
  32. 32.55 + ? = 100
  33. 33.5 + ? = 10
  34. 34.11 + ? = 100
  35. 35.74 + ? = 100
  36. 36.79 + ? = 100
  37. 37.24 + ? = 100
  38. 38.8 + ? = 10
  39. 39.39 + ? = 100
  40. 40.82 + ? = 100

Answer key

  1. 41
  2. 80
  3. 51
  4. 7
  5. 24
  6. 66
  7. 64
  8. 48
  9. 46
  10. 3
  11. 63
  12. 65
  13. 1
  14. 87
  15. 57
  16. 15
  17. 50
  18. 88
  19. 4
  20. 75
  21. 43
  22. 72
  23. 12
  24. 67
  25. 19
  26. 8
  27. 9
  28. 30
  29. 37
  30. 6
  31. 35
  32. 45
  33. 5
  34. 89
  35. 26
  36. 21
  37. 76
  38. 2
  39. 61
  40. 18

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