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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 78 · 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. 1.80 × 4 =
  2. 2.118 × 4 =
  3. 3.22 × 8 =
  4. 4.90 × 4 =
  5. 5.51 × 8 =
  6. 6.99 × 4 =
  7. 7.76 × 4 =
  8. 8.21 × 8 =
  9. 9.49 × 8 =
  10. 10.25 × 8 =
  11. 11.71 × 8 =
  12. 12.73 × 8 =
  13. 13.40 × 4 =
  14. 14.70 × 8 =
  15. 15.44 × 8 =
  16. 16.55 × 8 =
  17. 17.74 × 4 =
  18. 18.68 × 8 =
  19. 19.48 × 8 =
  20. 20.113 × 4 =
  21. 21.59 × 8 =
  22. 22.24 × 8 =
  23. 23.74 × 8 =
  24. 24.160 × 4 =
  25. 25.37 × 8 =
  26. 26.46 × 8 =
  27. 27.79 × 4 =
  28. 28.65 × 8 =
  29. 29.47 × 4 =
  30. 30.20 × 8 =
  31. 31.31 × 4 =
  32. 32.156 × 4 =
  33. 33.131 × 4 =
  34. 34.13 × 4 =
  35. 35.148 × 4 =
  36. 36.144 × 4 =
  37. 37.144 × 4 =
  38. 38.47 × 8 =
  39. 39.123 × 4 =
  40. 40.160 × 4 =

Answer key

  1. 320
  2. 472
  3. 176
  4. 360
  5. 408
  6. 396
  7. 304
  8. 168
  9. 392
  10. 200
  11. 568
  12. 584
  13. 160
  14. 560
  15. 352
  16. 440
  17. 296
  18. 544
  19. 384
  20. 452
  21. 472
  22. 192
  23. 592
  24. 640
  25. 296
  26. 368
  27. 316
  28. 520
  29. 188
  30. 160
  31. 124
  32. 624
  33. 524
  34. 52
  35. 592
  36. 576
  37. 576
  38. 376
  39. 492
  40. 640

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