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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 471 · 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. 1.30 × 15 =
  2. 2.65 × 18 =
  3. 3.22 × 125 =
  4. 4.25 × 24 =
  5. 5.65 × 14 =
  6. 6.35 × 6 =
  7. 7.6 × 15 =
  8. 8.20 × 45 =
  9. 9.45 × 8 =
  10. 10.20 × 55 =
  11. 11.125 × 34 =
  12. 12.10 × 125 =
  13. 13.45 × 8 =
  14. 14.45 × 22 =
  15. 15.32 × 15 =
  16. 16.14 × 65 =
  17. 17.15 × 8 =
  18. 18.75 × 14 =
  19. 19.65 × 20 =
  20. 20.35 × 12 =
  21. 21.15 × 20 =
  22. 22.14 × 35 =
  23. 23.25 × 38 =
  24. 24.14 × 55 =
  25. 25.35 × 20 =
  26. 26.6 × 65 =
  27. 27.34 × 125 =
  28. 28.14 × 75 =
  29. 29.125 × 6 =
  30. 30.28 × 35 =
  31. 31.45 × 40 =
  32. 32.12 × 45 =
  33. 33.18 × 45 =
  34. 34.65 × 28 =
  35. 35.75 × 36 =
  36. 36.35 × 28 =
  37. 37.125 × 40 =
  38. 38.40 × 45 =
  39. 39.55 × 26 =
  40. 40.16 × 55 =

Answer key

  1. 450
  2. 1170
  3. 2750
  4. 600
  5. 910
  6. 210
  7. 90
  8. 900
  9. 360
  10. 1100
  11. 4250
  12. 1250
  13. 360
  14. 990
  15. 480
  16. 910
  17. 120
  18. 1050
  19. 1300
  20. 420
  21. 300
  22. 490
  23. 950
  24. 770
  25. 700
  26. 390
  27. 4250
  28. 1050
  29. 750
  30. 980
  31. 1800
  32. 540
  33. 810
  34. 1820
  35. 2700
  36. 980
  37. 5000
  38. 1800
  39. 1430
  40. 880

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