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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 523 · 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. 1.135 × 4 =
  2. 2.98 × 4 =
  3. 3.14 × 8 =
  4. 4.101 × 4 =
  5. 5.93 × 4 =
  6. 6.52 × 8 =
  7. 7.29 × 8 =
  8. 8.50 × 8 =
  9. 9.50 × 8 =
  10. 10.13 × 8 =
  11. 11.99 × 4 =
  12. 12.65 × 8 =
  13. 13.22 × 4 =
  14. 14.41 × 8 =
  15. 15.133 × 4 =
  16. 16.34 × 4 =
  17. 17.18 × 4 =
  18. 18.65 × 8 =
  19. 19.44 × 8 =
  20. 20.160 × 4 =
  21. 21.38 × 8 =
  22. 22.20 × 8 =
  23. 23.150 × 4 =
  24. 24.151 × 4 =
  25. 25.114 × 4 =
  26. 26.83 × 4 =
  27. 27.70 × 4 =
  28. 28.29 × 4 =
  29. 29.47 × 8 =
  30. 30.14 × 8 =
  31. 31.113 × 4 =
  32. 32.80 × 4 =
  33. 33.70 × 4 =
  34. 34.30 × 4 =
  35. 35.57 × 8 =
  36. 36.127 × 4 =
  37. 37.57 × 4 =
  38. 38.19 × 8 =
  39. 39.108 × 4 =
  40. 40.37 × 8 =

Answer key

  1. 540
  2. 392
  3. 112
  4. 404
  5. 372
  6. 416
  7. 232
  8. 400
  9. 400
  10. 104
  11. 396
  12. 520
  13. 88
  14. 328
  15. 532
  16. 136
  17. 72
  18. 520
  19. 352
  20. 640
  21. 304
  22. 160
  23. 600
  24. 604
  25. 456
  26. 332
  27. 280
  28. 116
  29. 376
  30. 112
  31. 452
  32. 320
  33. 280
  34. 120
  35. 456
  36. 508
  37. 228
  38. 152
  39. 432
  40. 296

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