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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 180 · 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. 1.157 × 4 =
  2. 2.72 × 8 =
  3. 3.49 × 4 =
  4. 4.74 × 8 =
  5. 5.40 × 8 =
  6. 6.66 × 8 =
  7. 7.131 × 4 =
  8. 8.41 × 4 =
  9. 9.50 × 8 =
  10. 10.26 × 8 =
  11. 11.135 × 4 =
  12. 12.93 × 4 =
  13. 13.107 × 4 =
  14. 14.23 × 8 =
  15. 15.44 × 4 =
  16. 16.21 × 8 =
  17. 17.125 × 4 =
  18. 18.15 × 8 =
  19. 19.136 × 4 =
  20. 20.37 × 8 =
  21. 21.82 × 4 =
  22. 22.69 × 8 =
  23. 23.24 × 4 =
  24. 24.112 × 4 =
  25. 25.67 × 8 =
  26. 26.33 × 4 =
  27. 27.40 × 8 =
  28. 28.34 × 4 =
  29. 29.50 × 8 =
  30. 30.34 × 8 =
  31. 31.41 × 8 =
  32. 32.20 × 8 =
  33. 33.50 × 8 =
  34. 34.70 × 4 =
  35. 35.19 × 8 =
  36. 36.37 × 8 =
  37. 37.47 × 8 =
  38. 38.71 × 4 =
  39. 39.70 × 4 =
  40. 40.38 × 4 =

Answer key

  1. 628
  2. 576
  3. 196
  4. 592
  5. 320
  6. 528
  7. 524
  8. 164
  9. 400
  10. 208
  11. 540
  12. 372
  13. 428
  14. 184
  15. 176
  16. 168
  17. 500
  18. 120
  19. 544
  20. 296
  21. 328
  22. 552
  23. 96
  24. 448
  25. 536
  26. 132
  27. 320
  28. 136
  29. 400
  30. 272
  31. 328
  32. 160
  33. 400
  34. 280
  35. 152
  36. 296
  37. 376
  38. 284
  39. 280
  40. 152

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