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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 840 · 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. 1.45 × 20 =
  2. 2.34 × 75 =
  3. 3.75 × 18 =
  4. 4.125 × 40 =
  5. 5.55 × 6 =
  6. 6.34 × 125 =
  7. 7.125 × 20 =
  8. 8.28 × 75 =
  9. 9.24 × 65 =
  10. 10.25 × 14 =
  11. 11.35 × 20 =
  12. 12.35 × 8 =
  13. 13.18 × 35 =
  14. 14.8 × 125 =
  15. 15.15 × 28 =
  16. 16.65 × 10 =
  17. 17.45 × 10 =
  18. 18.65 × 10 =
  19. 19.36 × 125 =
  20. 20.38 × 55 =
  21. 21.65 × 22 =
  22. 22.12 × 75 =
  23. 23.34 × 35 =
  24. 24.45 × 28 =
  25. 25.45 × 20 =
  26. 26.75 × 38 =
  27. 27.14 × 15 =
  28. 28.8 × 65 =
  29. 29.8 × 55 =
  30. 30.24 × 45 =
  31. 31.35 × 16 =
  32. 32.28 × 65 =
  33. 33.15 × 32 =
  34. 34.45 × 18 =
  35. 35.65 × 38 =
  36. 36.15 × 40 =
  37. 37.14 × 45 =
  38. 38.55 × 30 =
  39. 39.30 × 35 =
  40. 40.34 × 75 =

Answer key

  1. 900
  2. 2550
  3. 1350
  4. 5000
  5. 330
  6. 4250
  7. 2500
  8. 2100
  9. 1560
  10. 350
  11. 700
  12. 280
  13. 630
  14. 1000
  15. 420
  16. 650
  17. 450
  18. 650
  19. 4500
  20. 2090
  21. 1430
  22. 900
  23. 1190
  24. 1260
  25. 900
  26. 2850
  27. 210
  28. 520
  29. 440
  30. 1080
  31. 560
  32. 1820
  33. 480
  34. 810
  35. 2470
  36. 600
  37. 630
  38. 1650
  39. 1050
  40. 2550

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