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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 490 · 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. 1.36 × 45 =
  2. 2.14 × 25 =
  3. 3.35 × 18 =
  4. 4.55 × 28 =
  5. 5.25 × 32 =
  6. 6.25 × 22 =
  7. 7.12 × 35 =
  8. 8.15 × 10 =
  9. 9.65 × 24 =
  10. 10.35 × 8 =
  11. 11.65 × 10 =
  12. 12.35 × 18 =
  13. 13.15 × 8 =
  14. 14.34 × 25 =
  15. 15.65 × 32 =
  16. 16.55 × 36 =
  17. 17.24 × 65 =
  18. 18.125 × 14 =
  19. 19.15 × 22 =
  20. 20.65 × 30 =
  21. 21.10 × 55 =
  22. 22.15 × 30 =
  23. 23.125 × 32 =
  24. 24.6 × 55 =
  25. 25.75 × 8 =
  26. 26.40 × 125 =
  27. 27.10 × 75 =
  28. 28.75 × 22 =
  29. 29.75 × 22 =
  30. 30.75 × 34 =
  31. 31.18 × 75 =
  32. 32.16 × 55 =
  33. 33.45 × 10 =
  34. 34.40 × 75 =
  35. 35.75 × 14 =
  36. 36.75 × 6 =
  37. 37.75 × 18 =
  38. 38.55 × 18 =
  39. 39.125 × 10 =
  40. 40.65 × 8 =

Answer key

  1. 1620
  2. 350
  3. 630
  4. 1540
  5. 800
  6. 550
  7. 420
  8. 150
  9. 1560
  10. 280
  11. 650
  12. 630
  13. 120
  14. 850
  15. 2080
  16. 1980
  17. 1560
  18. 1750
  19. 330
  20. 1950
  21. 550
  22. 450
  23. 4000
  24. 330
  25. 600
  26. 5000
  27. 750
  28. 1650
  29. 1650
  30. 2550
  31. 1350
  32. 880
  33. 450
  34. 3000
  35. 1050
  36. 450
  37. 1350
  38. 990
  39. 1250
  40. 520

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