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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 421 · 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. 1.48 × 8 =
  2. 2.159 × 4 =
  3. 3.24 × 4 =
  4. 4.62 × 8 =
  5. 5.51 × 8 =
  6. 6.27 × 4 =
  7. 7.35 × 4 =
  8. 8.54 × 4 =
  9. 9.156 × 4 =
  10. 10.75 × 8 =
  11. 11.81 × 4 =
  12. 12.59 × 8 =
  13. 13.15 × 4 =
  14. 14.157 × 4 =
  15. 15.112 × 4 =
  16. 16.95 × 4 =
  17. 17.81 × 4 =
  18. 18.37 × 8 =
  19. 19.97 × 4 =
  20. 20.27 × 4 =
  21. 21.52 × 8 =
  22. 22.67 × 4 =
  23. 23.152 × 4 =
  24. 24.43 × 8 =
  25. 25.136 × 4 =
  26. 26.46 × 4 =
  27. 27.47 × 8 =
  28. 28.27 × 8 =
  29. 29.44 × 8 =
  30. 30.113 × 4 =
  31. 31.20 × 8 =
  32. 32.47 × 8 =
  33. 33.40 × 8 =
  34. 34.57 × 8 =
  35. 35.101 × 4 =
  36. 36.13 × 8 =
  37. 37.33 × 8 =
  38. 38.28 × 8 =
  39. 39.97 × 4 =
  40. 40.20 × 8 =

Answer key

  1. 384
  2. 636
  3. 96
  4. 496
  5. 408
  6. 108
  7. 140
  8. 216
  9. 624
  10. 600
  11. 324
  12. 472
  13. 60
  14. 628
  15. 448
  16. 380
  17. 324
  18. 296
  19. 388
  20. 108
  21. 416
  22. 268
  23. 608
  24. 344
  25. 544
  26. 184
  27. 376
  28. 216
  29. 352
  30. 452
  31. 160
  32. 376
  33. 320
  34. 456
  35. 404
  36. 104
  37. 264
  38. 224
  39. 388
  40. 160

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