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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 485 · 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. 1.55 × 10 =
  2. 2.15 × 14 =
  3. 3.125 × 20 =
  4. 4.6 × 45 =
  5. 5.45 × 10 =
  6. 6.6 × 55 =
  7. 7.55 × 36 =
  8. 8.32 × 125 =
  9. 9.20 × 75 =
  10. 10.14 × 55 =
  11. 11.20 × 75 =
  12. 12.8 × 35 =
  13. 13.125 × 40 =
  14. 14.18 × 65 =
  15. 15.75 × 16 =
  16. 16.38 × 15 =
  17. 17.35 × 16 =
  18. 18.38 × 125 =
  19. 19.28 × 125 =
  20. 20.20 × 65 =
  21. 21.16 × 125 =
  22. 22.125 × 8 =
  23. 23.18 × 55 =
  24. 24.45 × 22 =
  25. 25.55 × 20 =
  26. 26.22 × 65 =
  27. 27.35 × 6 =
  28. 28.15 × 26 =
  29. 29.75 × 10 =
  30. 30.28 × 25 =
  31. 31.55 × 26 =
  32. 32.55 × 40 =
  33. 33.18 × 75 =
  34. 34.12 × 75 =
  35. 35.20 × 55 =
  36. 36.10 × 125 =
  37. 37.36 × 15 =
  38. 38.8 × 25 =
  39. 39.36 × 55 =
  40. 40.45 × 14 =

Answer key

  1. 550
  2. 210
  3. 2500
  4. 270
  5. 450
  6. 330
  7. 1980
  8. 4000
  9. 1500
  10. 770
  11. 1500
  12. 280
  13. 5000
  14. 1170
  15. 1200
  16. 570
  17. 560
  18. 4750
  19. 3500
  20. 1300
  21. 2000
  22. 1000
  23. 990
  24. 990
  25. 1100
  26. 1430
  27. 210
  28. 390
  29. 750
  30. 700
  31. 1430
  32. 2200
  33. 1350
  34. 900
  35. 1100
  36. 1250
  37. 540
  38. 200
  39. 1980
  40. 630

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