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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 647 · 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. 1.55 × 22 =
  2. 2.15 × 26 =
  3. 3.25 × 22 =
  4. 4.28 × 75 =
  5. 5.40 × 35 =
  6. 6.125 × 36 =
  7. 7.45 × 16 =
  8. 8.30 × 65 =
  9. 9.15 × 8 =
  10. 10.45 × 18 =
  11. 11.16 × 75 =
  12. 12.45 × 18 =
  13. 13.32 × 25 =
  14. 14.28 × 35 =
  15. 15.75 × 16 =
  16. 16.125 × 40 =
  17. 17.12 × 75 =
  18. 18.55 × 26 =
  19. 19.65 × 10 =
  20. 20.32 × 65 =
  21. 21.20 × 65 =
  22. 22.25 × 34 =
  23. 23.125 × 10 =
  24. 24.75 × 26 =
  25. 25.15 × 18 =
  26. 26.26 × 55 =
  27. 27.45 × 38 =
  28. 28.55 × 12 =
  29. 29.6 × 65 =
  30. 30.8 × 55 =
  31. 31.35 × 8 =
  32. 32.75 × 8 =
  33. 33.45 × 12 =
  34. 34.15 × 18 =
  35. 35.36 × 55 =
  36. 36.45 × 18 =
  37. 37.55 × 20 =
  38. 38.25 × 12 =
  39. 39.55 × 10 =
  40. 40.8 × 25 =

Answer key

  1. 1210
  2. 390
  3. 550
  4. 2100
  5. 1400
  6. 4500
  7. 720
  8. 1950
  9. 120
  10. 810
  11. 1200
  12. 810
  13. 800
  14. 980
  15. 1200
  16. 5000
  17. 900
  18. 1430
  19. 650
  20. 2080
  21. 1300
  22. 850
  23. 1250
  24. 1950
  25. 270
  26. 1430
  27. 1710
  28. 660
  29. 390
  30. 440
  31. 280
  32. 600
  33. 540
  34. 270
  35. 1980
  36. 810
  37. 1100
  38. 300
  39. 550
  40. 200

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