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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 171 · 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. 1.65 × 34 =
  2. 2.45 × 22 =
  3. 3.55 × 32 =
  4. 4.45 × 18 =
  5. 5.32 × 45 =
  6. 6.25 × 8 =
  7. 7.15 × 8 =
  8. 8.20 × 55 =
  9. 9.65 × 20 =
  10. 10.8 × 35 =
  11. 11.40 × 15 =
  12. 12.125 × 28 =
  13. 13.15 × 34 =
  14. 14.15 × 14 =
  15. 15.36 × 25 =
  16. 16.22 × 125 =
  17. 17.45 × 10 =
  18. 18.45 × 20 =
  19. 19.75 × 24 =
  20. 20.16 × 125 =
  21. 21.125 × 18 =
  22. 22.25 × 10 =
  23. 23.20 × 125 =
  24. 24.125 × 24 =
  25. 25.125 × 10 =
  26. 26.16 × 35 =
  27. 27.75 × 22 =
  28. 28.32 × 55 =
  29. 29.65 × 12 =
  30. 30.36 × 75 =
  31. 31.125 × 30 =
  32. 32.18 × 45 =
  33. 33.18 × 45 =
  34. 34.25 × 18 =
  35. 35.30 × 125 =
  36. 36.55 × 40 =
  37. 37.55 × 34 =
  38. 38.25 × 30 =
  39. 39.10 × 15 =
  40. 40.35 × 6 =

Answer key

  1. 2210
  2. 990
  3. 1760
  4. 810
  5. 1440
  6. 200
  7. 120
  8. 1100
  9. 1300
  10. 280
  11. 600
  12. 3500
  13. 510
  14. 210
  15. 900
  16. 2750
  17. 450
  18. 900
  19. 1800
  20. 2000
  21. 2250
  22. 250
  23. 2500
  24. 3000
  25. 1250
  26. 560
  27. 1650
  28. 1760
  29. 780
  30. 2700
  31. 3750
  32. 810
  33. 810
  34. 450
  35. 3750
  36. 2200
  37. 1870
  38. 750
  39. 150
  40. 210

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