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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 648 · 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. 1.35 × 18 =
  2. 2.75 × 40 =
  3. 3.45 × 14 =
  4. 4.15 × 24 =
  5. 5.14 × 65 =
  6. 6.40 × 45 =
  7. 7.32 × 45 =
  8. 8.75 × 36 =
  9. 9.75 × 18 =
  10. 10.38 × 65 =
  11. 11.25 × 14 =
  12. 12.28 × 75 =
  13. 13.125 × 30 =
  14. 14.125 × 28 =
  15. 15.55 × 32 =
  16. 16.35 × 16 =
  17. 17.125 × 16 =
  18. 18.55 × 26 =
  19. 19.65 × 20 =
  20. 20.55 × 40 =
  21. 21.28 × 35 =
  22. 22.25 × 34 =
  23. 23.34 × 125 =
  24. 24.12 × 55 =
  25. 25.25 × 26 =
  26. 26.40 × 75 =
  27. 27.16 × 35 =
  28. 28.16 × 25 =
  29. 29.35 × 30 =
  30. 30.35 × 40 =
  31. 31.36 × 55 =
  32. 32.36 × 25 =
  33. 33.45 × 6 =
  34. 34.15 × 38 =
  35. 35.6 × 15 =
  36. 36.125 × 16 =
  37. 37.36 × 15 =
  38. 38.45 × 36 =
  39. 39.10 × 75 =
  40. 40.20 × 25 =

Answer key

  1. 630
  2. 3000
  3. 630
  4. 360
  5. 910
  6. 1800
  7. 1440
  8. 2700
  9. 1350
  10. 2470
  11. 350
  12. 2100
  13. 3750
  14. 3500
  15. 1760
  16. 560
  17. 2000
  18. 1430
  19. 1300
  20. 2200
  21. 980
  22. 850
  23. 4250
  24. 660
  25. 650
  26. 3000
  27. 560
  28. 400
  29. 1050
  30. 1400
  31. 1980
  32. 900
  33. 270
  34. 570
  35. 90
  36. 2000
  37. 540
  38. 1620
  39. 750
  40. 500

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