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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 16 · 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. 1.75 + ? = 100
  2. 2.60 + ? = 100
  3. 3.23 + ? = 100
  4. 4.45 + ? = 100
  5. 5.25 + ? = 100
  6. 6.21 + ? = 100
  7. 7.6 + ? = 10
  8. 8.83 + ? = 100
  9. 9.63 + ? = 100
  10. 10.9 + ? = 10
  11. 11.36 + ? = 100
  12. 12.4 + ? = 10
  13. 13.73 + ? = 100
  14. 14.29 + ? = 100
  15. 15.13 + ? = 100
  16. 16.46 + ? = 100
  17. 17.8 + ? = 10
  18. 18.1 + ? = 10
  19. 19.3 + ? = 10
  20. 20.2 + ? = 10
  21. 21.16 + ? = 100
  22. 22.38 + ? = 100
  23. 23.12 + ? = 100
  24. 24.15 + ? = 100
  25. 25.87 + ? = 100
  26. 26.5 + ? = 10
  27. 27.59 + ? = 100
  28. 28.72 + ? = 100
  29. 29.7 + ? = 10
  30. 30.34 + ? = 100
  31. 31.41 + ? = 100
  32. 32.28 + ? = 100
  33. 33.77 + ? = 100
  34. 34.52 + ? = 100
  35. 35.11 + ? = 100
  36. 36.47 + ? = 100
  37. 37.40 + ? = 100
  38. 38.20 + ? = 100
  39. 39.76 + ? = 100
  40. 40.78 + ? = 100

Answer key

  1. 25
  2. 40
  3. 77
  4. 55
  5. 75
  6. 79
  7. 4
  8. 17
  9. 37
  10. 1
  11. 64
  12. 6
  13. 27
  14. 71
  15. 87
  16. 54
  17. 2
  18. 9
  19. 7
  20. 8
  21. 84
  22. 62
  23. 88
  24. 85
  25. 13
  26. 5
  27. 41
  28. 28
  29. 3
  30. 66
  31. 59
  32. 72
  33. 23
  34. 48
  35. 89
  36. 53
  37. 60
  38. 80
  39. 24
  40. 22

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