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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 626 · 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 × 20 =
  2. 2.55 × 14 =
  3. 3.55 × 32 =
  4. 4.55 × 12 =
  5. 5.125 × 14 =
  6. 6.24 × 75 =
  7. 7.36 × 25 =
  8. 8.26 × 25 =
  9. 9.35 × 16 =
  10. 10.15 × 20 =
  11. 11.8 × 35 =
  12. 12.75 × 22 =
  13. 13.14 × 75 =
  14. 14.15 × 8 =
  15. 15.25 × 36 =
  16. 16.15 × 40 =
  17. 17.40 × 35 =
  18. 18.8 × 65 =
  19. 19.65 × 36 =
  20. 20.14 × 45 =
  21. 21.35 × 10 =
  22. 22.12 × 45 =
  23. 23.20 × 65 =
  24. 24.14 × 125 =
  25. 25.15 × 20 =
  26. 26.18 × 15 =
  27. 27.15 × 34 =
  28. 28.55 × 36 =
  29. 29.24 × 25 =
  30. 30.125 × 28 =
  31. 31.36 × 125 =
  32. 32.15 × 6 =
  33. 33.32 × 75 =
  34. 34.26 × 15 =
  35. 35.26 × 75 =
  36. 36.8 × 25 =
  37. 37.36 × 65 =
  38. 38.28 × 125 =
  39. 39.65 × 14 =
  40. 40.125 × 32 =

Answer key

  1. 1300
  2. 770
  3. 1760
  4. 660
  5. 1750
  6. 1800
  7. 900
  8. 650
  9. 560
  10. 300
  11. 280
  12. 1650
  13. 1050
  14. 120
  15. 900
  16. 600
  17. 1400
  18. 520
  19. 2340
  20. 630
  21. 350
  22. 540
  23. 1300
  24. 1750
  25. 300
  26. 270
  27. 510
  28. 1980
  29. 600
  30. 3500
  31. 4500
  32. 90
  33. 2400
  34. 390
  35. 1950
  36. 200
  37. 2340
  38. 3500
  39. 910
  40. 4000

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