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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 310 · 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 × 12 =
  2. 2.35 × 18 =
  3. 3.75 × 30 =
  4. 4.20 × 45 =
  5. 5.10 × 65 =
  6. 6.65 × 22 =
  7. 7.12 × 15 =
  8. 8.16 × 25 =
  9. 9.25 × 16 =
  10. 10.45 × 10 =
  11. 11.15 × 16 =
  12. 12.6 × 75 =
  13. 13.45 × 40 =
  14. 14.36 × 25 =
  15. 15.55 × 8 =
  16. 16.16 × 75 =
  17. 17.20 × 75 =
  18. 18.38 × 125 =
  19. 19.45 × 32 =
  20. 20.45 × 8 =
  21. 21.32 × 45 =
  22. 22.35 × 28 =
  23. 23.15 × 12 =
  24. 24.125 × 30 =
  25. 25.125 × 12 =
  26. 26.55 × 36 =
  27. 27.15 × 20 =
  28. 28.125 × 16 =
  29. 29.12 × 45 =
  30. 30.125 × 40 =
  31. 31.125 × 22 =
  32. 32.25 × 32 =
  33. 33.125 × 24 =
  34. 34.15 × 6 =
  35. 35.22 × 125 =
  36. 36.25 × 38 =
  37. 37.65 × 6 =
  38. 38.18 × 75 =
  39. 39.35 × 32 =
  40. 40.75 × 40 =

Answer key

  1. 780
  2. 630
  3. 2250
  4. 900
  5. 650
  6. 1430
  7. 180
  8. 400
  9. 400
  10. 450
  11. 240
  12. 450
  13. 1800
  14. 900
  15. 440
  16. 1200
  17. 1500
  18. 4750
  19. 1440
  20. 360
  21. 1440
  22. 980
  23. 180
  24. 3750
  25. 1500
  26. 1980
  27. 300
  28. 2000
  29. 540
  30. 5000
  31. 2750
  32. 800
  33. 3000
  34. 90
  35. 2750
  36. 950
  37. 390
  38. 1350
  39. 1120
  40. 3000

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