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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 821 · 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. 1.35 × 6 =
  2. 2.8 × 35 =
  3. 3.45 × 22 =
  4. 4.22 × 25 =
  5. 5.55 × 22 =
  6. 6.28 × 35 =
  7. 7.22 × 15 =
  8. 8.20 × 55 =
  9. 9.40 × 55 =
  10. 10.6 × 65 =
  11. 11.65 × 32 =
  12. 12.38 × 25 =
  13. 13.26 × 35 =
  14. 14.125 × 20 =
  15. 15.35 × 12 =
  16. 16.45 × 36 =
  17. 17.35 × 30 =
  18. 18.25 × 14 =
  19. 19.125 × 28 =
  20. 20.40 × 65 =
  21. 21.28 × 25 =
  22. 22.75 × 40 =
  23. 23.25 × 8 =
  24. 24.38 × 75 =
  25. 25.14 × 45 =
  26. 26.125 × 36 =
  27. 27.38 × 45 =
  28. 28.55 × 38 =
  29. 29.25 × 36 =
  30. 30.14 × 65 =
  31. 31.12 × 45 =
  32. 32.15 × 12 =
  33. 33.65 × 10 =
  34. 34.34 × 75 =
  35. 35.8 × 25 =
  36. 36.65 × 6 =
  37. 37.6 × 65 =
  38. 38.65 × 14 =
  39. 39.35 × 10 =
  40. 40.12 × 45 =

Answer key

  1. 210
  2. 280
  3. 990
  4. 550
  5. 1210
  6. 980
  7. 330
  8. 1100
  9. 2200
  10. 390
  11. 2080
  12. 950
  13. 910
  14. 2500
  15. 420
  16. 1620
  17. 1050
  18. 350
  19. 3500
  20. 2600
  21. 700
  22. 3000
  23. 200
  24. 2850
  25. 630
  26. 4500
  27. 1710
  28. 2090
  29. 900
  30. 910
  31. 540
  32. 180
  33. 650
  34. 2550
  35. 200
  36. 390
  37. 390
  38. 910
  39. 350
  40. 540

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