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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 13 · 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 × 38 =
  2. 2.75 × 20 =
  3. 3.45 × 28 =
  4. 4.8 × 15 =
  5. 5.125 × 32 =
  6. 6.45 × 38 =
  7. 7.75 × 26 =
  8. 8.75 × 36 =
  9. 9.18 × 25 =
  10. 10.125 × 40 =
  11. 11.30 × 65 =
  12. 12.38 × 55 =
  13. 13.35 × 38 =
  14. 14.25 × 20 =
  15. 15.45 × 6 =
  16. 16.6 × 45 =
  17. 17.15 × 6 =
  18. 18.15 × 34 =
  19. 19.15 × 12 =
  20. 20.65 × 20 =
  21. 21.8 × 15 =
  22. 22.65 × 10 =
  23. 23.10 × 125 =
  24. 24.35 × 14 =
  25. 25.45 × 8 =
  26. 26.125 × 34 =
  27. 27.24 × 45 =
  28. 28.20 × 75 =
  29. 29.30 × 15 =
  30. 30.26 × 35 =
  31. 31.30 × 65 =
  32. 32.55 × 38 =
  33. 33.34 × 25 =
  34. 34.15 × 18 =
  35. 35.34 × 35 =
  36. 36.22 × 15 =
  37. 37.30 × 35 =
  38. 38.20 × 25 =
  39. 39.55 × 28 =
  40. 40.6 × 25 =

Answer key

  1. 2470
  2. 1500
  3. 1260
  4. 120
  5. 4000
  6. 1710
  7. 1950
  8. 2700
  9. 450
  10. 5000
  11. 1950
  12. 2090
  13. 1330
  14. 500
  15. 270
  16. 270
  17. 90
  18. 510
  19. 180
  20. 1300
  21. 120
  22. 650
  23. 1250
  24. 490
  25. 360
  26. 4250
  27. 1080
  28. 1500
  29. 450
  30. 910
  31. 1950
  32. 2090
  33. 850
  34. 270
  35. 1190
  36. 330
  37. 1050
  38. 500
  39. 1540
  40. 150

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