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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 65 · 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. 1.15 × 30 =
  2. 2.25 × 24 =
  3. 3.40 × 125 =
  4. 4.30 × 45 =
  5. 5.15 × 8 =
  6. 6.32 × 125 =
  7. 7.65 × 32 =
  8. 8.45 × 34 =
  9. 9.28 × 65 =
  10. 10.10 × 55 =
  11. 11.25 × 6 =
  12. 12.15 × 20 =
  13. 13.55 × 16 =
  14. 14.35 × 8 =
  15. 15.75 × 8 =
  16. 16.65 × 14 =
  17. 17.24 × 75 =
  18. 18.14 × 65 =
  19. 19.15 × 28 =
  20. 20.65 × 6 =
  21. 21.35 × 28 =
  22. 22.45 × 22 =
  23. 23.12 × 55 =
  24. 24.75 × 32 =
  25. 25.125 × 8 =
  26. 26.45 × 10 =
  27. 27.15 × 30 =
  28. 28.125 × 36 =
  29. 29.14 × 45 =
  30. 30.125 × 34 =
  31. 31.12 × 125 =
  32. 32.75 × 30 =
  33. 33.45 × 16 =
  34. 34.28 × 15 =
  35. 35.125 × 18 =
  36. 36.15 × 24 =
  37. 37.6 × 15 =
  38. 38.45 × 10 =
  39. 39.65 × 30 =
  40. 40.40 × 55 =

Answer key

  1. 450
  2. 600
  3. 5000
  4. 1350
  5. 120
  6. 4000
  7. 2080
  8. 1530
  9. 1820
  10. 550
  11. 150
  12. 300
  13. 880
  14. 280
  15. 600
  16. 910
  17. 1800
  18. 910
  19. 420
  20. 390
  21. 980
  22. 990
  23. 660
  24. 2400
  25. 1000
  26. 450
  27. 450
  28. 4500
  29. 630
  30. 4250
  31. 1500
  32. 2250
  33. 720
  34. 420
  35. 2250
  36. 360
  37. 90
  38. 450
  39. 1950
  40. 2200

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