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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 111 · 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. 1.43 + ? = 100
  2. 2.54 + ? = 100
  3. 3.25 + ? = 100
  4. 4.15 + ? = 100
  5. 5.8 + ? = 10
  6. 6.9 + ? = 10
  7. 7.69 + ? = 100
  8. 8.1 + ? = 10
  9. 9.71 + ? = 100
  10. 10.16 + ? = 100
  11. 11.3 + ? = 10
  12. 12.31 + ? = 100
  13. 13.70 + ? = 100
  14. 14.40 + ? = 100
  15. 15.5 + ? = 10
  16. 16.73 + ? = 100
  17. 17.22 + ? = 100
  18. 18.44 + ? = 100
  19. 19.45 + ? = 100
  20. 20.77 + ? = 100
  21. 21.2 + ? = 10
  22. 22.6 + ? = 10
  23. 23.14 + ? = 100
  24. 24.11 + ? = 100
  25. 25.35 + ? = 100
  26. 26.39 + ? = 100
  27. 27.28 + ? = 100
  28. 28.4 + ? = 10
  29. 29.36 + ? = 100
  30. 30.76 + ? = 100
  31. 31.7 + ? = 10
  32. 32.81 + ? = 100
  33. 33.30 + ? = 100
  34. 34.82 + ? = 100
  35. 35.21 + ? = 100
  36. 36.26 + ? = 100
  37. 37.74 + ? = 100
  38. 38.33 + ? = 100
  39. 39.67 + ? = 100
  40. 40.80 + ? = 100

Answer key

  1. 57
  2. 46
  3. 75
  4. 85
  5. 2
  6. 1
  7. 31
  8. 9
  9. 29
  10. 84
  11. 7
  12. 69
  13. 30
  14. 60
  15. 5
  16. 27
  17. 78
  18. 56
  19. 55
  20. 23
  21. 8
  22. 4
  23. 86
  24. 89
  25. 65
  26. 61
  27. 72
  28. 6
  29. 64
  30. 24
  31. 3
  32. 19
  33. 70
  34. 18
  35. 79
  36. 74
  37. 26
  38. 67
  39. 33
  40. 20

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