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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 45 · 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. 1.12 × 45 =
  2. 2.35 × 38 =
  3. 3.125 × 18 =
  4. 4.45 × 16 =
  5. 5.75 × 24 =
  6. 6.55 × 32 =
  7. 7.22 × 75 =
  8. 8.24 × 15 =
  9. 9.8 × 45 =
  10. 10.55 × 26 =
  11. 11.26 × 65 =
  12. 12.24 × 125 =
  13. 13.14 × 45 =
  14. 14.55 × 6 =
  15. 15.34 × 45 =
  16. 16.26 × 35 =
  17. 17.55 × 38 =
  18. 18.35 × 18 =
  19. 19.40 × 75 =
  20. 20.55 × 6 =
  21. 21.45 × 28 =
  22. 22.15 × 24 =
  23. 23.45 × 10 =
  24. 24.6 × 35 =
  25. 25.12 × 15 =
  26. 26.15 × 40 =
  27. 27.125 × 26 =
  28. 28.65 × 14 =
  29. 29.16 × 65 =
  30. 30.25 × 16 =
  31. 31.25 × 10 =
  32. 32.10 × 55 =
  33. 33.34 × 35 =
  34. 34.25 × 10 =
  35. 35.40 × 15 =
  36. 36.10 × 55 =
  37. 37.25 × 26 =
  38. 38.20 × 45 =
  39. 39.75 × 30 =
  40. 40.45 × 20 =

Answer key

  1. 540
  2. 1330
  3. 2250
  4. 720
  5. 1800
  6. 1760
  7. 1650
  8. 360
  9. 360
  10. 1430
  11. 1690
  12. 3000
  13. 630
  14. 330
  15. 1530
  16. 910
  17. 2090
  18. 630
  19. 3000
  20. 330
  21. 1260
  22. 360
  23. 450
  24. 210
  25. 180
  26. 600
  27. 3250
  28. 910
  29. 1040
  30. 400
  31. 250
  32. 550
  33. 1190
  34. 250
  35. 600
  36. 550
  37. 650
  38. 900
  39. 2250
  40. 900

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