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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 12 · 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 × 34 =
  2. 2.25 × 22 =
  3. 3.38 × 55 =
  4. 4.32 × 125 =
  5. 5.65 × 36 =
  6. 6.15 × 20 =
  7. 7.10 × 65 =
  8. 8.20 × 55 =
  9. 9.75 × 26 =
  10. 10.65 × 12 =
  11. 11.25 × 40 =
  12. 12.125 × 10 =
  13. 13.125 × 30 =
  14. 14.30 × 55 =
  15. 15.55 × 40 =
  16. 16.35 × 14 =
  17. 17.38 × 65 =
  18. 18.14 × 45 =
  19. 19.35 × 24 =
  20. 20.45 × 16 =
  21. 21.40 × 45 =
  22. 22.24 × 35 =
  23. 23.26 × 75 =
  24. 24.26 × 25 =
  25. 25.6 × 125 =
  26. 26.35 × 26 =
  27. 27.65 × 34 =
  28. 28.35 × 16 =
  29. 29.14 × 15 =
  30. 30.14 × 45 =
  31. 31.125 × 16 =
  32. 32.45 × 30 =
  33. 33.35 × 26 =
  34. 34.36 × 55 =
  35. 35.75 × 10 =
  36. 36.6 × 45 =
  37. 37.26 × 25 =
  38. 38.45 × 6 =
  39. 39.65 × 20 =
  40. 40.32 × 75 =

Answer key

  1. 1870
  2. 550
  3. 2090
  4. 4000
  5. 2340
  6. 300
  7. 650
  8. 1100
  9. 1950
  10. 780
  11. 1000
  12. 1250
  13. 3750
  14. 1650
  15. 2200
  16. 490
  17. 2470
  18. 630
  19. 840
  20. 720
  21. 1800
  22. 840
  23. 1950
  24. 650
  25. 750
  26. 910
  27. 2210
  28. 560
  29. 210
  30. 630
  31. 2000
  32. 1350
  33. 910
  34. 1980
  35. 750
  36. 270
  37. 650
  38. 270
  39. 1300
  40. 2400

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