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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 521 · 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 × 32 =
  2. 2.22 × 15 =
  3. 3.45 × 10 =
  4. 4.6 × 125 =
  5. 5.125 × 36 =
  6. 6.65 × 26 =
  7. 7.35 × 8 =
  8. 8.45 × 38 =
  9. 9.65 × 22 =
  10. 10.45 × 8 =
  11. 11.125 × 36 =
  12. 12.16 × 35 =
  13. 13.65 × 34 =
  14. 14.55 × 22 =
  15. 15.25 × 36 =
  16. 16.55 × 24 =
  17. 17.55 × 20 =
  18. 18.15 × 30 =
  19. 19.16 × 15 =
  20. 20.40 × 55 =
  21. 21.65 × 20 =
  22. 22.8 × 35 =
  23. 23.125 × 10 =
  24. 24.15 × 32 =
  25. 25.125 × 34 =
  26. 26.32 × 15 =
  27. 27.15 × 16 =
  28. 28.65 × 36 =
  29. 29.20 × 55 =
  30. 30.125 × 22 =
  31. 31.20 × 55 =
  32. 32.35 × 36 =
  33. 33.26 × 25 =
  34. 34.8 × 15 =
  35. 35.12 × 15 =
  36. 36.15 × 12 =
  37. 37.36 × 25 =
  38. 38.75 × 18 =
  39. 39.25 × 14 =
  40. 40.75 × 12 =

Answer key

  1. 1760
  2. 330
  3. 450
  4. 750
  5. 4500
  6. 1690
  7. 280
  8. 1710
  9. 1430
  10. 360
  11. 4500
  12. 560
  13. 2210
  14. 1210
  15. 900
  16. 1320
  17. 1100
  18. 450
  19. 240
  20. 2200
  21. 1300
  22. 280
  23. 1250
  24. 480
  25. 4250
  26. 480
  27. 240
  28. 2340
  29. 1100
  30. 2750
  31. 1100
  32. 1260
  33. 650
  34. 120
  35. 180
  36. 180
  37. 900
  38. 1350
  39. 350
  40. 900

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