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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 20 · 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 × 20 =
  2. 2.35 × 14 =
  3. 3.15 × 12 =
  4. 4.45 × 10 =
  5. 5.125 × 40 =
  6. 6.18 × 125 =
  7. 7.125 × 32 =
  8. 8.45 × 40 =
  9. 9.14 × 45 =
  10. 10.75 × 18 =
  11. 11.6 × 25 =
  12. 12.35 × 36 =
  13. 13.35 × 24 =
  14. 14.45 × 26 =
  15. 15.6 × 35 =
  16. 16.24 × 25 =
  17. 17.30 × 125 =
  18. 18.125 × 24 =
  19. 19.125 × 20 =
  20. 20.40 × 25 =
  21. 21.38 × 65 =
  22. 22.26 × 55 =
  23. 23.55 × 8 =
  24. 24.45 × 20 =
  25. 25.125 × 8 =
  26. 26.20 × 125 =
  27. 27.38 × 45 =
  28. 28.35 × 20 =
  29. 29.22 × 45 =
  30. 30.14 × 25 =
  31. 31.55 × 40 =
  32. 32.32 × 25 =
  33. 33.40 × 75 =
  34. 34.35 × 18 =
  35. 35.36 × 25 =
  36. 36.15 × 16 =
  37. 37.55 × 18 =
  38. 38.125 × 6 =
  39. 39.75 × 30 =
  40. 40.125 × 34 =

Answer key

  1. 1100
  2. 490
  3. 180
  4. 450
  5. 5000
  6. 2250
  7. 4000
  8. 1800
  9. 630
  10. 1350
  11. 150
  12. 1260
  13. 840
  14. 1170
  15. 210
  16. 600
  17. 3750
  18. 3000
  19. 2500
  20. 1000
  21. 2470
  22. 1430
  23. 440
  24. 900
  25. 1000
  26. 2500
  27. 1710
  28. 700
  29. 990
  30. 350
  31. 2200
  32. 800
  33. 3000
  34. 630
  35. 900
  36. 240
  37. 990
  38. 750
  39. 2250
  40. 4250

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