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Number Bonds Worksheet (to 10 and 100)

Mental maths lesson 1: Number bonds to 10 and 100 · Set 173 · 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. 1.83 + ? = 100
  2. 2.85 + ? = 100
  3. 3.7 + ? = 10
  4. 4.24 + ? = 100
  5. 5.2 + ? = 10
  6. 6.78 + ? = 100
  7. 7.9 + ? = 10
  8. 8.88 + ? = 100
  9. 9.80 + ? = 100
  10. 10.4 + ? = 10
  11. 11.81 + ? = 100
  12. 12.8 + ? = 10
  13. 13.75 + ? = 100
  14. 14.34 + ? = 100
  15. 15.30 + ? = 100
  16. 16.32 + ? = 100
  17. 17.77 + ? = 100
  18. 18.3 + ? = 10
  19. 19.5 + ? = 10
  20. 20.23 + ? = 100
  21. 21.40 + ? = 100
  22. 22.43 + ? = 100
  23. 23.76 + ? = 100
  24. 24.1 + ? = 10
  25. 25.55 + ? = 100
  26. 26.26 + ? = 100
  27. 27.60 + ? = 100
  28. 28.22 + ? = 100
  29. 29.50 + ? = 100
  30. 30.54 + ? = 100
  31. 31.65 + ? = 100
  32. 32.37 + ? = 100
  33. 33.6 + ? = 10
  34. 34.38 + ? = 100
  35. 35.58 + ? = 100
  36. 36.16 + ? = 100
  37. 37.2 + ? = 10
  38. 38.12 + ? = 100
  39. 39.69 + ? = 100
  40. 40.11 + ? = 100

Answer key

  1. 17
  2. 15
  3. 3
  4. 76
  5. 8
  6. 22
  7. 1
  8. 12
  9. 20
  10. 6
  11. 19
  12. 2
  13. 25
  14. 66
  15. 70
  16. 68
  17. 23
  18. 7
  19. 5
  20. 77
  21. 60
  22. 57
  23. 24
  24. 9
  25. 45
  26. 74
  27. 40
  28. 78
  29. 50
  30. 46
  31. 35
  32. 63
  33. 4
  34. 62
  35. 42
  36. 84
  37. 8
  38. 88
  39. 31
  40. 89

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