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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 540 · 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. 1.82 × 4 =
  2. 2.79 × 4 =
  3. 3.108 × 4 =
  4. 4.152 × 4 =
  5. 5.56 × 8 =
  6. 6.18 × 4 =
  7. 7.118 × 4 =
  8. 8.43 × 8 =
  9. 9.16 × 8 =
  10. 10.87 × 4 =
  11. 11.73 × 4 =
  12. 12.37 × 8 =
  13. 13.68 × 4 =
  14. 14.27 × 8 =
  15. 15.15 × 4 =
  16. 16.108 × 4 =
  17. 17.16 × 4 =
  18. 18.53 × 8 =
  19. 19.154 × 4 =
  20. 20.33 × 8 =
  21. 21.40 × 8 =
  22. 22.44 × 8 =
  23. 23.108 × 4 =
  24. 24.127 × 4 =
  25. 25.68 × 8 =
  26. 26.46 × 8 =
  27. 27.59 × 8 =
  28. 28.160 × 4 =
  29. 29.89 × 4 =
  30. 30.47 × 8 =
  31. 31.65 × 8 =
  32. 32.21 × 8 =
  33. 33.117 × 4 =
  34. 34.64 × 4 =
  35. 35.42 × 8 =
  36. 36.57 × 4 =
  37. 37.31 × 8 =
  38. 38.136 × 4 =
  39. 39.18 × 8 =
  40. 40.15 × 8 =

Answer key

  1. 328
  2. 316
  3. 432
  4. 608
  5. 448
  6. 72
  7. 472
  8. 344
  9. 128
  10. 348
  11. 292
  12. 296
  13. 272
  14. 216
  15. 60
  16. 432
  17. 64
  18. 424
  19. 616
  20. 264
  21. 320
  22. 352
  23. 432
  24. 508
  25. 544
  26. 368
  27. 472
  28. 640
  29. 356
  30. 376
  31. 520
  32. 168
  33. 468
  34. 256
  35. 336
  36. 228
  37. 248
  38. 544
  39. 144
  40. 120

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