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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 634 · 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. 1.39 × 8 =
  2. 2.51 × 8 =
  3. 3.145 × 4 =
  4. 4.29 × 4 =
  5. 5.158 × 4 =
  6. 6.83 × 4 =
  7. 7.44 × 8 =
  8. 8.74 × 4 =
  9. 9.49 × 8 =
  10. 10.95 × 4 =
  11. 11.78 × 4 =
  12. 12.54 × 4 =
  13. 13.41 × 4 =
  14. 14.48 × 4 =
  15. 15.114 × 4 =
  16. 16.92 × 4 =
  17. 17.148 × 4 =
  18. 18.39 × 8 =
  19. 19.74 × 8 =
  20. 20.121 × 4 =
  21. 21.15 × 8 =
  22. 22.17 × 4 =
  23. 23.153 × 4 =
  24. 24.66 × 4 =
  25. 25.21 × 4 =
  26. 26.135 × 4 =
  27. 27.46 × 8 =
  28. 28.67 × 8 =
  29. 29.54 × 4 =
  30. 30.105 × 4 =
  31. 31.13 × 8 =
  32. 32.22 × 8 =
  33. 33.106 × 4 =
  34. 34.153 × 4 =
  35. 35.112 × 4 =
  36. 36.30 × 8 =
  37. 37.131 × 4 =
  38. 38.131 × 4 =
  39. 39.38 × 4 =
  40. 40.156 × 4 =

Answer key

  1. 312
  2. 408
  3. 580
  4. 116
  5. 632
  6. 332
  7. 352
  8. 296
  9. 392
  10. 380
  11. 312
  12. 216
  13. 164
  14. 192
  15. 456
  16. 368
  17. 592
  18. 312
  19. 592
  20. 484
  21. 120
  22. 68
  23. 612
  24. 264
  25. 84
  26. 540
  27. 368
  28. 536
  29. 216
  30. 420
  31. 104
  32. 176
  33. 424
  34. 612
  35. 448
  36. 240
  37. 524
  38. 524
  39. 152
  40. 624

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