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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 671 · 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. 2.6 × 15 =
  3. 3.35 × 24 =
  4. 4.8 × 75 =
  5. 5.35 × 34 =
  6. 6.16 × 55 =
  7. 7.24 × 15 =
  8. 8.14 × 25 =
  9. 9.12 × 45 =
  10. 10.45 × 14 =
  11. 11.65 × 28 =
  12. 12.25 × 10 =
  13. 13.16 × 15 =
  14. 14.30 × 35 =
  15. 15.35 × 22 =
  16. 16.8 × 45 =
  17. 17.45 × 6 =
  18. 18.45 × 8 =
  19. 19.45 × 18 =
  20. 20.15 × 36 =
  21. 21.36 × 25 =
  22. 22.55 × 32 =
  23. 23.20 × 65 =
  24. 24.75 × 30 =
  25. 25.26 × 65 =
  26. 26.65 × 14 =
  27. 27.35 × 18 =
  28. 28.12 × 45 =
  29. 29.45 × 36 =
  30. 30.12 × 35 =
  31. 31.75 × 12 =
  32. 32.34 × 75 =
  33. 33.12 × 55 =
  34. 34.12 × 55 =
  35. 35.35 × 8 =
  36. 36.40 × 65 =
  37. 37.24 × 25 =
  38. 38.40 × 25 =
  39. 39.8 × 35 =
  40. 40.45 × 36 =

Answer key

  1. 1300
  2. 90
  3. 840
  4. 600
  5. 1190
  6. 880
  7. 360
  8. 350
  9. 540
  10. 630
  11. 1820
  12. 250
  13. 240
  14. 1050
  15. 770
  16. 360
  17. 270
  18. 360
  19. 810
  20. 540
  21. 900
  22. 1760
  23. 1300
  24. 2250
  25. 1690
  26. 910
  27. 630
  28. 540
  29. 1620
  30. 420
  31. 900
  32. 2550
  33. 660
  34. 660
  35. 280
  36. 2600
  37. 600
  38. 1000
  39. 280
  40. 1620

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