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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 697 · 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. 1.4 + ? = 10
  2. 2.1 + ? = 10
  3. 3.8 + ? = 10
  4. 4.3 + ? = 10
  5. 5.5 + ? = 10
  6. 6.6 + ? = 10
  7. 7.59 + ? = 100
  8. 8.77 + ? = 100
  9. 9.20 + ? = 100
  10. 10.84 + ? = 100
  11. 11.49 + ? = 100
  12. 12.31 + ? = 100
  13. 13.89 + ? = 100
  14. 14.75 + ? = 100
  15. 15.7 + ? = 10
  16. 16.44 + ? = 100
  17. 17.87 + ? = 100
  18. 18.68 + ? = 100
  19. 19.27 + ? = 100
  20. 20.15 + ? = 100
  21. 21.9 + ? = 10
  22. 22.2 + ? = 10
  23. 23.52 + ? = 100
  24. 24.28 + ? = 100
  25. 25.79 + ? = 100
  26. 26.29 + ? = 100
  27. 27.83 + ? = 100
  28. 28.25 + ? = 100
  29. 29.32 + ? = 100
  30. 30.24 + ? = 100
  31. 31.45 + ? = 100
  32. 32.12 + ? = 100
  33. 33.33 + ? = 100
  34. 34.67 + ? = 100
  35. 35.53 + ? = 100
  36. 36.37 + ? = 100
  37. 37.14 + ? = 100
  38. 38.39 + ? = 100
  39. 39.65 + ? = 100
  40. 40.38 + ? = 100

Answer key

  1. 6
  2. 9
  3. 2
  4. 7
  5. 5
  6. 4
  7. 41
  8. 23
  9. 80
  10. 16
  11. 51
  12. 69
  13. 11
  14. 25
  15. 3
  16. 56
  17. 13
  18. 32
  19. 73
  20. 85
  21. 1
  22. 8
  23. 48
  24. 72
  25. 21
  26. 71
  27. 17
  28. 75
  29. 68
  30. 76
  31. 55
  32. 88
  33. 67
  34. 33
  35. 47
  36. 63
  37. 86
  38. 61
  39. 35
  40. 62

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