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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 17 · 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 × 6 =
  2. 2.20 × 15 =
  3. 3.8 × 15 =
  4. 4.38 × 35 =
  5. 5.125 × 14 =
  6. 6.15 × 36 =
  7. 7.8 × 25 =
  8. 8.45 × 6 =
  9. 9.15 × 26 =
  10. 10.40 × 35 =
  11. 11.28 × 35 =
  12. 12.36 × 35 =
  13. 13.35 × 6 =
  14. 14.10 × 65 =
  15. 15.12 × 35 =
  16. 16.15 × 16 =
  17. 17.16 × 55 =
  18. 18.25 × 16 =
  19. 19.65 × 32 =
  20. 20.32 × 125 =
  21. 21.16 × 25 =
  22. 22.45 × 24 =
  23. 23.18 × 55 =
  24. 24.125 × 10 =
  25. 25.38 × 65 =
  26. 26.75 × 8 =
  27. 27.18 × 45 =
  28. 28.8 × 75 =
  29. 29.35 × 12 =
  30. 30.30 × 65 =
  31. 31.25 × 22 =
  32. 32.12 × 35 =
  33. 33.15 × 8 =
  34. 34.25 × 36 =
  35. 35.25 × 26 =
  36. 36.125 × 34 =
  37. 37.25 × 36 =
  38. 38.10 × 15 =
  39. 39.55 × 28 =
  40. 40.18 × 15 =

Answer key

  1. 270
  2. 300
  3. 120
  4. 1330
  5. 1750
  6. 540
  7. 200
  8. 270
  9. 390
  10. 1400
  11. 980
  12. 1260
  13. 210
  14. 650
  15. 420
  16. 240
  17. 880
  18. 400
  19. 2080
  20. 4000
  21. 400
  22. 1080
  23. 990
  24. 1250
  25. 2470
  26. 600
  27. 810
  28. 600
  29. 420
  30. 1950
  31. 550
  32. 420
  33. 120
  34. 900
  35. 650
  36. 4250
  37. 900
  38. 150
  39. 1540
  40. 270

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