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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 511 · 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. 1.19 + ? = 100
  2. 2.86 + ? = 100
  3. 3.5 + ? = 10
  4. 4.15 + ? = 100
  5. 5.65 + ? = 100
  6. 6.35 + ? = 100
  7. 7.8 + ? = 10
  8. 8.18 + ? = 100
  9. 9.3 + ? = 10
  10. 10.62 + ? = 100
  11. 11.9 + ? = 10
  12. 12.70 + ? = 100
  13. 13.7 + ? = 10
  14. 14.67 + ? = 100
  15. 15.38 + ? = 100
  16. 16.52 + ? = 100
  17. 17.4 + ? = 10
  18. 18.17 + ? = 100
  19. 19.6 + ? = 10
  20. 20.26 + ? = 100
  21. 21.40 + ? = 100
  22. 22.47 + ? = 100
  23. 23.49 + ? = 100
  24. 24.1 + ? = 10
  25. 25.60 + ? = 100
  26. 26.50 + ? = 100
  27. 27.2 + ? = 10
  28. 28.44 + ? = 100
  29. 29.22 + ? = 100
  30. 30.34 + ? = 100
  31. 31.28 + ? = 100
  32. 32.66 + ? = 100
  33. 33.54 + ? = 100
  34. 34.37 + ? = 100
  35. 35.39 + ? = 100
  36. 36.76 + ? = 100
  37. 37.33 + ? = 100
  38. 38.82 + ? = 100
  39. 39.68 + ? = 100
  40. 40.81 + ? = 100

Answer key

  1. 81
  2. 14
  3. 5
  4. 85
  5. 35
  6. 65
  7. 2
  8. 82
  9. 7
  10. 38
  11. 1
  12. 30
  13. 3
  14. 33
  15. 62
  16. 48
  17. 6
  18. 83
  19. 4
  20. 74
  21. 60
  22. 53
  23. 51
  24. 9
  25. 40
  26. 50
  27. 8
  28. 56
  29. 78
  30. 66
  31. 72
  32. 34
  33. 46
  34. 63
  35. 61
  36. 24
  37. 67
  38. 18
  39. 32
  40. 19

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