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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 257 · 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. 1.8 × 75 =
  2. 2.6 × 15 =
  3. 3.125 × 38 =
  4. 4.15 × 10 =
  5. 5.10 × 15 =
  6. 6.75 × 10 =
  7. 7.16 × 35 =
  8. 8.16 × 125 =
  9. 9.16 × 15 =
  10. 10.40 × 45 =
  11. 11.8 × 55 =
  12. 12.25 × 30 =
  13. 13.35 × 28 =
  14. 14.28 × 15 =
  15. 15.24 × 45 =
  16. 16.55 × 20 =
  17. 17.125 × 10 =
  18. 18.25 × 22 =
  19. 19.25 × 10 =
  20. 20.65 × 10 =
  21. 21.18 × 15 =
  22. 22.35 × 10 =
  23. 23.45 × 24 =
  24. 24.16 × 15 =
  25. 25.45 × 36 =
  26. 26.10 × 15 =
  27. 27.125 × 28 =
  28. 28.45 × 12 =
  29. 29.14 × 125 =
  30. 30.38 × 75 =
  31. 31.32 × 65 =
  32. 32.55 × 22 =
  33. 33.36 × 65 =
  34. 34.35 × 8 =
  35. 35.35 × 22 =
  36. 36.45 × 22 =
  37. 37.18 × 35 =
  38. 38.12 × 125 =
  39. 39.75 × 14 =
  40. 40.45 × 32 =

Answer key

  1. 600
  2. 90
  3. 4750
  4. 150
  5. 150
  6. 750
  7. 560
  8. 2000
  9. 240
  10. 1800
  11. 440
  12. 750
  13. 980
  14. 420
  15. 1080
  16. 1100
  17. 1250
  18. 550
  19. 250
  20. 650
  21. 270
  22. 350
  23. 1080
  24. 240
  25. 1620
  26. 150
  27. 3500
  28. 540
  29. 1750
  30. 2850
  31. 2080
  32. 1210
  33. 2340
  34. 280
  35. 770
  36. 990
  37. 630
  38. 1500
  39. 1050
  40. 1440

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