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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 803 · 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 × 36 =
  2. 2.65 × 30 =
  3. 3.25 × 32 =
  4. 4.65 × 20 =
  5. 5.55 × 24 =
  6. 6.75 × 14 =
  7. 7.12 × 25 =
  8. 8.35 × 14 =
  9. 9.30 × 25 =
  10. 10.26 × 75 =
  11. 11.25 × 40 =
  12. 12.75 × 10 =
  13. 13.6 × 15 =
  14. 14.15 × 10 =
  15. 15.35 × 36 =
  16. 16.6 × 125 =
  17. 17.15 × 18 =
  18. 18.75 × 12 =
  19. 19.16 × 65 =
  20. 20.125 × 6 =
  21. 21.55 × 10 =
  22. 22.16 × 125 =
  23. 23.14 × 15 =
  24. 24.15 × 24 =
  25. 25.65 × 16 =
  26. 26.75 × 12 =
  27. 27.12 × 125 =
  28. 28.15 × 32 =
  29. 29.55 × 6 =
  30. 30.12 × 25 =
  31. 31.36 × 55 =
  32. 32.45 × 8 =
  33. 33.15 × 20 =
  34. 34.125 × 10 =
  35. 35.125 × 30 =
  36. 36.65 × 12 =
  37. 37.125 × 30 =
  38. 38.35 × 10 =
  39. 39.65 × 12 =
  40. 40.34 × 35 =

Answer key

  1. 1980
  2. 1950
  3. 800
  4. 1300
  5. 1320
  6. 1050
  7. 300
  8. 490
  9. 750
  10. 1950
  11. 1000
  12. 750
  13. 90
  14. 150
  15. 1260
  16. 750
  17. 270
  18. 900
  19. 1040
  20. 750
  21. 550
  22. 2000
  23. 210
  24. 360
  25. 1040
  26. 900
  27. 1500
  28. 480
  29. 330
  30. 300
  31. 1980
  32. 360
  33. 300
  34. 1250
  35. 3750
  36. 780
  37. 3750
  38. 350
  39. 780
  40. 1190

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