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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 849 · 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. 1.34 × 15 =
  2. 2.45 × 34 =
  3. 3.12 × 125 =
  4. 4.125 × 10 =
  5. 5.15 × 16 =
  6. 6.26 × 15 =
  7. 7.25 × 28 =
  8. 8.15 × 8 =
  9. 9.12 × 65 =
  10. 10.16 × 75 =
  11. 11.125 × 10 =
  12. 12.24 × 15 =
  13. 13.34 × 65 =
  14. 14.32 × 35 =
  15. 15.15 × 6 =
  16. 16.15 × 18 =
  17. 17.20 × 15 =
  18. 18.35 × 30 =
  19. 19.14 × 55 =
  20. 20.65 × 32 =
  21. 21.35 × 12 =
  22. 22.36 × 75 =
  23. 23.35 × 26 =
  24. 24.125 × 10 =
  25. 25.55 × 38 =
  26. 26.35 × 8 =
  27. 27.8 × 25 =
  28. 28.10 × 75 =
  29. 29.22 × 15 =
  30. 30.25 × 40 =
  31. 31.55 × 6 =
  32. 32.14 × 15 =
  33. 33.28 × 55 =
  34. 34.15 × 24 =
  35. 35.45 × 30 =
  36. 36.75 × 32 =
  37. 37.10 × 65 =
  38. 38.25 × 32 =
  39. 39.35 × 8 =
  40. 40.45 × 16 =

Answer key

  1. 510
  2. 1530
  3. 1500
  4. 1250
  5. 240
  6. 390
  7. 700
  8. 120
  9. 780
  10. 1200
  11. 1250
  12. 360
  13. 2210
  14. 1120
  15. 90
  16. 270
  17. 300
  18. 1050
  19. 770
  20. 2080
  21. 420
  22. 2700
  23. 910
  24. 1250
  25. 2090
  26. 280
  27. 200
  28. 750
  29. 330
  30. 1000
  31. 330
  32. 210
  33. 1540
  34. 360
  35. 1350
  36. 2400
  37. 650
  38. 800
  39. 280
  40. 720

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