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Doubling and Halving Worksheet

Tables & multiplication lesson 14: Doubling and halving · Set 917 · 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 × 22 =
  2. 2.25 × 10 =
  3. 3.36 × 15 =
  4. 4.38 × 25 =
  5. 5.15 × 38 =
  6. 6.26 × 55 =
  7. 7.65 × 18 =
  8. 8.65 × 16 =
  9. 9.25 × 6 =
  10. 10.15 × 6 =
  11. 11.12 × 75 =
  12. 12.65 × 34 =
  13. 13.125 × 28 =
  14. 14.65 × 40 =
  15. 15.15 × 26 =
  16. 16.15 × 38 =
  17. 17.35 × 14 =
  18. 18.75 × 10 =
  19. 19.75 × 40 =
  20. 20.10 × 75 =
  21. 21.15 × 22 =
  22. 22.55 × 14 =
  23. 23.6 × 15 =
  24. 24.16 × 15 =
  25. 25.38 × 45 =
  26. 26.14 × 35 =
  27. 27.15 × 28 =
  28. 28.55 × 40 =
  29. 29.10 × 25 =
  30. 30.65 × 12 =
  31. 31.18 × 35 =
  32. 32.25 × 40 =
  33. 33.55 × 24 =
  34. 34.125 × 38 =
  35. 35.65 × 38 =
  36. 36.125 × 32 =
  37. 37.35 × 40 =
  38. 38.8 × 55 =
  39. 39.30 × 75 =
  40. 40.12 × 65 =

Answer key

  1. 1430
  2. 250
  3. 540
  4. 950
  5. 570
  6. 1430
  7. 1170
  8. 1040
  9. 150
  10. 90
  11. 900
  12. 2210
  13. 3500
  14. 2600
  15. 390
  16. 570
  17. 490
  18. 750
  19. 3000
  20. 750
  21. 330
  22. 770
  23. 90
  24. 240
  25. 1710
  26. 490
  27. 420
  28. 2200
  29. 250
  30. 780
  31. 630
  32. 1000
  33. 1320
  34. 4750
  35. 2470
  36. 4000
  37. 1400
  38. 440
  39. 2250
  40. 780

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