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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 766 · 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 × 40 =
  2. 2.45 × 16 =
  3. 3.28 × 15 =
  4. 4.15 × 36 =
  5. 5.14 × 25 =
  6. 6.28 × 45 =
  7. 7.15 × 40 =
  8. 8.16 × 45 =
  9. 9.32 × 25 =
  10. 10.125 × 32 =
  11. 11.75 × 34 =
  12. 12.16 × 125 =
  13. 13.40 × 25 =
  14. 14.15 × 40 =
  15. 15.16 × 15 =
  16. 16.75 × 20 =
  17. 17.28 × 35 =
  18. 18.40 × 55 =
  19. 19.35 × 28 =
  20. 20.125 × 26 =
  21. 21.18 × 45 =
  22. 22.45 × 10 =
  23. 23.45 × 38 =
  24. 24.75 × 22 =
  25. 25.25 × 12 =
  26. 26.30 × 35 =
  27. 27.26 × 125 =
  28. 28.24 × 35 =
  29. 29.28 × 75 =
  30. 30.26 × 65 =
  31. 31.45 × 12 =
  32. 32.125 × 12 =
  33. 33.45 × 34 =
  34. 34.75 × 20 =
  35. 35.6 × 15 =
  36. 36.15 × 28 =
  37. 37.65 × 36 =
  38. 38.15 × 36 =
  39. 39.15 × 34 =
  40. 40.125 × 24 =

Answer key

  1. 2600
  2. 720
  3. 420
  4. 540
  5. 350
  6. 1260
  7. 600
  8. 720
  9. 800
  10. 4000
  11. 2550
  12. 2000
  13. 1000
  14. 600
  15. 240
  16. 1500
  17. 980
  18. 2200
  19. 980
  20. 3250
  21. 810
  22. 450
  23. 1710
  24. 1650
  25. 300
  26. 1050
  27. 3250
  28. 840
  29. 2100
  30. 1690
  31. 540
  32. 1500
  33. 1530
  34. 1500
  35. 90
  36. 420
  37. 2340
  38. 540
  39. 510
  40. 3000

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