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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 331 · 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. 1.120 × 4 =
  2. 2.24 × 4 =
  3. 3.47 × 8 =
  4. 4.86 × 4 =
  5. 5.27 × 8 =
  6. 6.25 × 8 =
  7. 7.36 × 4 =
  8. 8.29 × 8 =
  9. 9.33 × 8 =
  10. 10.32 × 8 =
  11. 11.38 × 8 =
  12. 12.148 × 4 =
  13. 13.74 × 4 =
  14. 14.75 × 8 =
  15. 15.146 × 4 =
  16. 16.47 × 8 =
  17. 17.46 × 8 =
  18. 18.104 × 4 =
  19. 19.134 × 4 =
  20. 20.52 × 8 =
  21. 21.156 × 4 =
  22. 22.89 × 4 =
  23. 23.22 × 8 =
  24. 24.13 × 8 =
  25. 25.69 × 4 =
  26. 26.41 × 4 =
  27. 27.16 × 8 =
  28. 28.36 × 4 =
  29. 29.95 × 4 =
  30. 30.47 × 8 =
  31. 31.38 × 8 =
  32. 32.30 × 8 =
  33. 33.158 × 4 =
  34. 34.44 × 8 =
  35. 35.28 × 8 =
  36. 36.83 × 4 =
  37. 37.54 × 4 =
  38. 38.20 × 8 =
  39. 39.66 × 4 =
  40. 40.144 × 4 =

Answer key

  1. 480
  2. 96
  3. 376
  4. 344
  5. 216
  6. 200
  7. 144
  8. 232
  9. 264
  10. 256
  11. 304
  12. 592
  13. 296
  14. 600
  15. 584
  16. 376
  17. 368
  18. 416
  19. 536
  20. 416
  21. 624
  22. 356
  23. 176
  24. 104
  25. 276
  26. 164
  27. 128
  28. 144
  29. 380
  30. 376
  31. 304
  32. 240
  33. 632
  34. 352
  35. 224
  36. 332
  37. 216
  38. 160
  39. 264
  40. 576

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