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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 524 · 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. 1.65 × 10 =
  2. 2.28 × 55 =
  3. 3.65 × 38 =
  4. 4.40 × 25 =
  5. 5.6 × 65 =
  6. 6.45 × 26 =
  7. 7.30 × 15 =
  8. 8.32 × 15 =
  9. 9.28 × 25 =
  10. 10.8 × 65 =
  11. 11.32 × 75 =
  12. 12.65 × 30 =
  13. 13.75 × 14 =
  14. 14.24 × 55 =
  15. 15.15 × 34 =
  16. 16.22 × 25 =
  17. 17.12 × 25 =
  18. 18.55 × 38 =
  19. 19.75 × 38 =
  20. 20.24 × 15 =
  21. 21.45 × 40 =
  22. 22.22 × 15 =
  23. 23.25 × 24 =
  24. 24.22 × 125 =
  25. 25.15 × 10 =
  26. 26.65 × 40 =
  27. 27.10 × 35 =
  28. 28.18 × 35 =
  29. 29.40 × 125 =
  30. 30.14 × 55 =
  31. 31.15 × 8 =
  32. 32.35 × 34 =
  33. 33.65 × 14 =
  34. 34.125 × 40 =
  35. 35.75 × 32 =
  36. 36.35 × 32 =
  37. 37.40 × 55 =
  38. 38.55 × 32 =
  39. 39.75 × 22 =
  40. 40.65 × 16 =

Answer key

  1. 650
  2. 1540
  3. 2470
  4. 1000
  5. 390
  6. 1170
  7. 450
  8. 480
  9. 700
  10. 520
  11. 2400
  12. 1950
  13. 1050
  14. 1320
  15. 510
  16. 550
  17. 300
  18. 2090
  19. 2850
  20. 360
  21. 1800
  22. 330
  23. 600
  24. 2750
  25. 150
  26. 2600
  27. 350
  28. 630
  29. 5000
  30. 770
  31. 120
  32. 1190
  33. 910
  34. 5000
  35. 2400
  36. 1120
  37. 2200
  38. 1760
  39. 1650
  40. 1040

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