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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 483 · 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. 2.26 × 15 =
  3. 3.18 × 45 =
  4. 4.18 × 35 =
  5. 5.125 × 32 =
  6. 6.18 × 125 =
  7. 7.15 × 34 =
  8. 8.45 × 20 =
  9. 9.55 × 10 =
  10. 10.45 × 22 =
  11. 11.18 × 75 =
  12. 12.28 × 55 =
  13. 13.14 × 15 =
  14. 14.25 × 16 =
  15. 15.26 × 65 =
  16. 16.75 × 8 =
  17. 17.38 × 35 =
  18. 18.55 × 8 =
  19. 19.30 × 45 =
  20. 20.35 × 34 =
  21. 21.14 × 15 =
  22. 22.30 × 15 =
  23. 23.125 × 28 =
  24. 24.6 × 35 =
  25. 25.55 × 26 =
  26. 26.6 × 25 =
  27. 27.6 × 25 =
  28. 28.40 × 45 =
  29. 29.6 × 65 =
  30. 30.36 × 35 =
  31. 31.125 × 8 =
  32. 32.15 × 38 =
  33. 33.45 × 16 =
  34. 34.65 × 32 =
  35. 35.35 × 24 =
  36. 36.125 × 8 =
  37. 37.45 × 12 =
  38. 38.35 × 28 =
  39. 39.22 × 15 =
  40. 40.34 × 125 =

Answer key

  1. 1300
  2. 390
  3. 810
  4. 630
  5. 4000
  6. 2250
  7. 510
  8. 900
  9. 550
  10. 990
  11. 1350
  12. 1540
  13. 210
  14. 400
  15. 1690
  16. 600
  17. 1330
  18. 440
  19. 1350
  20. 1190
  21. 210
  22. 450
  23. 3500
  24. 210
  25. 1430
  26. 150
  27. 150
  28. 1800
  29. 390
  30. 1260
  31. 1000
  32. 570
  33. 720
  34. 2080
  35. 840
  36. 1000
  37. 540
  38. 980
  39. 330
  40. 4250

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