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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 477 · 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. 2.15 × 10 =
  3. 3.75 × 32 =
  4. 4.45 × 14 =
  5. 5.25 × 24 =
  6. 6.12 × 75 =
  7. 7.125 × 20 =
  8. 8.75 × 26 =
  9. 9.45 × 8 =
  10. 10.75 × 22 =
  11. 11.35 × 24 =
  12. 12.6 × 125 =
  13. 13.75 × 14 =
  14. 14.25 × 22 =
  15. 15.36 × 65 =
  16. 16.75 × 30 =
  17. 17.12 × 25 =
  18. 18.8 × 75 =
  19. 19.15 × 26 =
  20. 20.6 × 25 =
  21. 21.34 × 65 =
  22. 22.35 × 20 =
  23. 23.125 × 24 =
  24. 24.16 × 125 =
  25. 25.25 × 16 =
  26. 26.8 × 15 =
  27. 27.25 × 12 =
  28. 28.22 × 125 =
  29. 29.36 × 45 =
  30. 30.125 × 16 =
  31. 31.22 × 15 =
  32. 32.75 × 6 =
  33. 33.65 × 22 =
  34. 34.32 × 15 =
  35. 35.125 × 10 =
  36. 36.45 × 8 =
  37. 37.35 × 18 =
  38. 38.25 × 22 =
  39. 39.15 × 16 =
  40. 40.15 × 20 =

Answer key

  1. 900
  2. 150
  3. 2400
  4. 630
  5. 600
  6. 900
  7. 2500
  8. 1950
  9. 360
  10. 1650
  11. 840
  12. 750
  13. 1050
  14. 550
  15. 2340
  16. 2250
  17. 300
  18. 600
  19. 390
  20. 150
  21. 2210
  22. 700
  23. 3000
  24. 2000
  25. 400
  26. 120
  27. 300
  28. 2750
  29. 1620
  30. 2000
  31. 330
  32. 450
  33. 1430
  34. 480
  35. 1250
  36. 360
  37. 630
  38. 550
  39. 240
  40. 300

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