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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 239 · 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. 1.49 + ? = 100
  2. 2.65 + ? = 100
  3. 3.5 + ? = 10
  4. 4.2 + ? = 10
  5. 5.69 + ? = 100
  6. 6.4 + ? = 10
  7. 7.43 + ? = 100
  8. 8.83 + ? = 100
  9. 9.75 + ? = 100
  10. 10.46 + ? = 100
  11. 11.50 + ? = 100
  12. 12.1 + ? = 10
  13. 13.76 + ? = 100
  14. 14.56 + ? = 100
  15. 15.7 + ? = 10
  16. 16.48 + ? = 100
  17. 17.6 + ? = 10
  18. 18.3 + ? = 10
  19. 19.38 + ? = 100
  20. 20.8 + ? = 10
  21. 21.9 + ? = 10
  22. 22.32 + ? = 100
  23. 23.62 + ? = 100
  24. 24.44 + ? = 100
  25. 25.31 + ? = 100
  26. 26.15 + ? = 100
  27. 27.73 + ? = 100
  28. 28.80 + ? = 100
  29. 29.55 + ? = 100
  30. 30.40 + ? = 100
  31. 31.67 + ? = 100
  32. 32.68 + ? = 100
  33. 33.12 + ? = 100
  34. 34.66 + ? = 100
  35. 35.14 + ? = 100
  36. 36.18 + ? = 100
  37. 37.35 + ? = 100
  38. 38.89 + ? = 100
  39. 39.39 + ? = 100
  40. 40.25 + ? = 100

Answer key

  1. 51
  2. 35
  3. 5
  4. 8
  5. 31
  6. 6
  7. 57
  8. 17
  9. 25
  10. 54
  11. 50
  12. 9
  13. 24
  14. 44
  15. 3
  16. 52
  17. 4
  18. 7
  19. 62
  20. 2
  21. 1
  22. 68
  23. 38
  24. 56
  25. 69
  26. 85
  27. 27
  28. 20
  29. 45
  30. 60
  31. 33
  32. 32
  33. 88
  34. 34
  35. 86
  36. 82
  37. 65
  38. 11
  39. 61
  40. 75

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