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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 492 · 40 questions
TalentJR

The fast method (Double up): × 4: double, then double again. × 8: double three times. To double a big number, double the tens and the ones separately and add: double 37 = 60 + 14 = 74.

NameDateTime takenScore ___ / 40
  1. 1.28 × 8 =
  2. 2.70 × 8 =
  3. 3.143 × 4 =
  4. 4.41 × 8 =
  5. 5.20 × 8 =
  6. 6.37 × 8 =
  7. 7.98 × 4 =
  8. 8.65 × 4 =
  9. 9.60 × 8 =
  10. 10.65 × 8 =
  11. 11.22 × 4 =
  12. 12.93 × 4 =
  13. 13.24 × 4 =
  14. 14.153 × 4 =
  15. 15.105 × 4 =
  16. 16.74 × 4 =
  17. 17.114 × 4 =
  18. 18.51 × 4 =
  19. 19.112 × 4 =
  20. 20.115 × 4 =
  21. 21.29 × 8 =
  22. 22.106 × 4 =
  23. 23.50 × 8 =
  24. 24.112 × 4 =
  25. 25.55 × 8 =
  26. 26.74 × 8 =
  27. 27.42 × 4 =
  28. 28.29 × 8 =
  29. 29.157 × 4 =
  30. 30.48 × 8 =
  31. 31.93 × 4 =
  32. 32.108 × 4 =
  33. 33.19 × 8 =
  34. 34.47 × 8 =
  35. 35.55 × 8 =
  36. 36.151 × 4 =
  37. 37.52 × 8 =
  38. 38.59 × 8 =
  39. 39.137 × 4 =
  40. 40.74 × 4 =

Answer key

  1. 224
  2. 560
  3. 572
  4. 328
  5. 160
  6. 296
  7. 392
  8. 260
  9. 480
  10. 520
  11. 88
  12. 372
  13. 96
  14. 612
  15. 420
  16. 296
  17. 456
  18. 204
  19. 448
  20. 460
  21. 232
  22. 424
  23. 400
  24. 448
  25. 440
  26. 592
  27. 168
  28. 232
  29. 628
  30. 384
  31. 372
  32. 432
  33. 152
  34. 376
  35. 440
  36. 604
  37. 416
  38. 472
  39. 548
  40. 296

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