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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 175 · 40 questions
TalentJR

How it works (Double and halve): Find the number ending in 5 and the even number. Double the one ending in 5; halve the even one. Repeat while it helps (25 → 50 → 100), then multiply.

NameDateTime takenScore ___ / 40
  1. 1.65 × 28 =
  2. 2.15 × 22 =
  3. 3.75 × 28 =
  4. 4.65 × 14 =
  5. 5.25 × 34 =
  6. 6.8 × 65 =
  7. 7.18 × 15 =
  8. 8.8 × 25 =
  9. 9.45 × 32 =
  10. 10.32 × 65 =
  11. 11.65 × 28 =
  12. 12.36 × 15 =
  13. 13.6 × 55 =
  14. 14.36 × 75 =
  15. 15.18 × 75 =
  16. 16.40 × 125 =
  17. 17.24 × 75 =
  18. 18.125 × 36 =
  19. 19.25 × 18 =
  20. 20.75 × 10 =
  21. 21.8 × 65 =
  22. 22.10 × 125 =
  23. 23.25 × 38 =
  24. 24.75 × 26 =
  25. 25.45 × 10 =
  26. 26.55 × 30 =
  27. 27.28 × 25 =
  28. 28.14 × 45 =
  29. 29.38 × 125 =
  30. 30.34 × 55 =
  31. 31.35 × 40 =
  32. 32.10 × 65 =
  33. 33.12 × 35 =
  34. 34.15 × 40 =
  35. 35.15 × 26 =
  36. 36.125 × 40 =
  37. 37.38 × 55 =
  38. 38.25 × 22 =
  39. 39.55 × 38 =
  40. 40.8 × 75 =

Answer key

  1. 1820
  2. 330
  3. 2100
  4. 910
  5. 850
  6. 520
  7. 270
  8. 200
  9. 1440
  10. 2080
  11. 1820
  12. 540
  13. 330
  14. 2700
  15. 1350
  16. 5000
  17. 1800
  18. 4500
  19. 450
  20. 750
  21. 520
  22. 1250
  23. 950
  24. 1950
  25. 450
  26. 1650
  27. 700
  28. 630
  29. 4750
  30. 1870
  31. 1400
  32. 650
  33. 420
  34. 600
  35. 390
  36. 5000
  37. 2090
  38. 550
  39. 2090
  40. 600

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