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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 686 · 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. 1.13 + ? = 100
  2. 2.1 + ? = 10
  3. 3.5 + ? = 10
  4. 4.25 + ? = 100
  5. 5.6 + ? = 10
  6. 6.21 + ? = 100
  7. 7.15 + ? = 100
  8. 8.2 + ? = 10
  9. 9.49 + ? = 100
  10. 10.73 + ? = 100
  11. 11.7 + ? = 10
  12. 12.81 + ? = 100
  13. 13.3 + ? = 10
  14. 14.4 + ? = 10
  15. 15.74 + ? = 100
  16. 16.28 + ? = 100
  17. 17.9 + ? = 10
  18. 18.60 + ? = 100
  19. 19.38 + ? = 100
  20. 20.41 + ? = 100
  21. 21.27 + ? = 100
  22. 22.52 + ? = 100
  23. 23.37 + ? = 100
  24. 24.19 + ? = 100
  25. 25.12 + ? = 100
  26. 26.62 + ? = 100
  27. 27.85 + ? = 100
  28. 28.70 + ? = 100
  29. 29.8 + ? = 10
  30. 30.18 + ? = 100
  31. 31.42 + ? = 100
  32. 32.56 + ? = 100
  33. 33.32 + ? = 100
  34. 34.88 + ? = 100
  35. 35.55 + ? = 100
  36. 36.33 + ? = 100
  37. 37.30 + ? = 100
  38. 38.84 + ? = 100
  39. 39.59 + ? = 100
  40. 40.75 + ? = 100

Answer key

  1. 87
  2. 9
  3. 5
  4. 75
  5. 4
  6. 79
  7. 85
  8. 8
  9. 51
  10. 27
  11. 3
  12. 19
  13. 7
  14. 6
  15. 26
  16. 72
  17. 1
  18. 40
  19. 62
  20. 59
  21. 73
  22. 48
  23. 63
  24. 81
  25. 88
  26. 38
  27. 15
  28. 30
  29. 2
  30. 82
  31. 58
  32. 44
  33. 68
  34. 12
  35. 45
  36. 67
  37. 70
  38. 16
  39. 41
  40. 25

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