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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 224 · 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. 1.34 × 8 =
  2. 2.95 × 4 =
  3. 3.105 × 4 =
  4. 4.47 × 8 =
  5. 5.45 × 8 =
  6. 6.31 × 8 =
  7. 7.38 × 4 =
  8. 8.113 × 4 =
  9. 9.12 × 8 =
  10. 10.61 × 4 =
  11. 11.72 × 8 =
  12. 12.63 × 8 =
  13. 13.117 × 4 =
  14. 14.99 × 4 =
  15. 15.28 × 4 =
  16. 16.155 × 4 =
  17. 17.32 × 8 =
  18. 18.30 × 8 =
  19. 19.57 × 8 =
  20. 20.49 × 8 =
  21. 21.104 × 4 =
  22. 22.160 × 4 =
  23. 23.160 × 4 =
  24. 24.138 × 4 =
  25. 25.151 × 4 =
  26. 26.150 × 4 =
  27. 27.123 × 4 =
  28. 28.57 × 4 =
  29. 29.63 × 8 =
  30. 30.58 × 8 =
  31. 31.70 × 8 =
  32. 32.57 × 4 =
  33. 33.60 × 8 =
  34. 34.94 × 4 =
  35. 35.41 × 8 =
  36. 36.121 × 4 =
  37. 37.57 × 4 =
  38. 38.138 × 4 =
  39. 39.39 × 4 =
  40. 40.106 × 4 =

Answer key

  1. 272
  2. 380
  3. 420
  4. 376
  5. 360
  6. 248
  7. 152
  8. 452
  9. 96
  10. 244
  11. 576
  12. 504
  13. 468
  14. 396
  15. 112
  16. 620
  17. 256
  18. 240
  19. 456
  20. 392
  21. 416
  22. 640
  23. 640
  24. 552
  25. 604
  26. 600
  27. 492
  28. 228
  29. 504
  30. 464
  31. 560
  32. 228
  33. 480
  34. 376
  35. 328
  36. 484
  37. 228
  38. 552
  39. 156
  40. 424

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