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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 809 · 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 × 34 =
  2. 2.36 × 35 =
  3. 3.12 × 65 =
  4. 4.14 × 45 =
  5. 5.45 × 40 =
  6. 6.22 × 25 =
  7. 7.35 × 18 =
  8. 8.30 × 75 =
  9. 9.25 × 8 =
  10. 10.34 × 25 =
  11. 11.10 × 45 =
  12. 12.65 × 14 =
  13. 13.125 × 20 =
  14. 14.35 × 14 =
  15. 15.75 × 24 =
  16. 16.6 × 35 =
  17. 17.28 × 25 =
  18. 18.75 × 22 =
  19. 19.32 × 35 =
  20. 20.14 × 25 =
  21. 21.15 × 30 =
  22. 22.6 × 25 =
  23. 23.20 × 15 =
  24. 24.18 × 25 =
  25. 25.40 × 125 =
  26. 26.26 × 45 =
  27. 27.125 × 32 =
  28. 28.25 × 20 =
  29. 29.15 × 14 =
  30. 30.35 × 40 =
  31. 31.55 × 38 =
  32. 32.35 × 12 =
  33. 33.45 × 22 =
  34. 34.45 × 14 =
  35. 35.16 × 55 =
  36. 36.18 × 35 =
  37. 37.65 × 14 =
  38. 38.125 × 22 =
  39. 39.75 × 32 =
  40. 40.32 × 125 =

Answer key

  1. 1870
  2. 1260
  3. 780
  4. 630
  5. 1800
  6. 550
  7. 630
  8. 2250
  9. 200
  10. 850
  11. 450
  12. 910
  13. 2500
  14. 490
  15. 1800
  16. 210
  17. 700
  18. 1650
  19. 1120
  20. 350
  21. 450
  22. 150
  23. 300
  24. 450
  25. 5000
  26. 1170
  27. 4000
  28. 500
  29. 210
  30. 1400
  31. 2090
  32. 420
  33. 990
  34. 630
  35. 880
  36. 630
  37. 910
  38. 2750
  39. 2400
  40. 4000

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