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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 74 · 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. 1.64 × 8 =
  2. 2.53 × 8 =
  3. 3.40 × 8 =
  4. 4.55 × 4 =
  5. 5.59 × 8 =
  6. 6.25 × 8 =
  7. 7.100 × 4 =
  8. 8.54 × 4 =
  9. 9.28 × 8 =
  10. 10.42 × 8 =
  11. 11.51 × 8 =
  12. 12.145 × 4 =
  13. 13.42 × 4 =
  14. 14.52 × 8 =
  15. 15.140 × 4 =
  16. 16.80 × 4 =
  17. 17.82 × 4 =
  18. 18.149 × 4 =
  19. 19.82 × 4 =
  20. 20.27 × 8 =
  21. 21.64 × 4 =
  22. 22.51 × 4 =
  23. 23.44 × 8 =
  24. 24.44 × 4 =
  25. 25.27 × 8 =
  26. 26.48 × 4 =
  27. 27.49 × 8 =
  28. 28.115 × 4 =
  29. 29.28 × 4 =
  30. 30.96 × 4 =
  31. 31.83 × 4 =
  32. 32.131 × 4 =
  33. 33.91 × 4 =
  34. 34.44 × 8 =
  35. 35.94 × 4 =
  36. 36.15 × 8 =
  37. 37.12 × 8 =
  38. 38.31 × 8 =
  39. 39.64 × 4 =
  40. 40.53 × 8 =

Answer key

  1. 512
  2. 424
  3. 320
  4. 220
  5. 472
  6. 200
  7. 400
  8. 216
  9. 224
  10. 336
  11. 408
  12. 580
  13. 168
  14. 416
  15. 560
  16. 320
  17. 328
  18. 596
  19. 328
  20. 216
  21. 256
  22. 204
  23. 352
  24. 176
  25. 216
  26. 192
  27. 392
  28. 460
  29. 112
  30. 384
  31. 332
  32. 524
  33. 364
  34. 352
  35. 376
  36. 120
  37. 96
  38. 248
  39. 256
  40. 424

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