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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 79 · 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. 1.49 × 4 =
  2. 2.79 × 4 =
  3. 3.73 × 8 =
  4. 4.55 × 8 =
  5. 5.145 × 4 =
  6. 6.52 × 8 =
  7. 7.30 × 8 =
  8. 8.26 × 8 =
  9. 9.38 × 8 =
  10. 10.30 × 8 =
  11. 11.93 × 4 =
  12. 12.120 × 4 =
  13. 13.13 × 8 =
  14. 14.46 × 8 =
  15. 15.54 × 4 =
  16. 16.33 × 8 =
  17. 17.137 × 4 =
  18. 18.32 × 8 =
  19. 19.68 × 8 =
  20. 20.158 × 4 =
  21. 21.22 × 8 =
  22. 22.99 × 4 =
  23. 23.109 × 4 =
  24. 24.60 × 8 =
  25. 25.17 × 4 =
  26. 26.108 × 4 =
  27. 27.45 × 4 =
  28. 28.95 × 4 =
  29. 29.47 × 8 =
  30. 30.39 × 8 =
  31. 31.66 × 4 =
  32. 32.38 × 4 =
  33. 33.93 × 4 =
  34. 34.30 × 8 =
  35. 35.57 × 8 =
  36. 36.54 × 8 =
  37. 37.22 × 8 =
  38. 38.19 × 4 =
  39. 39.20 × 8 =
  40. 40.42 × 4 =

Answer key

  1. 196
  2. 316
  3. 584
  4. 440
  5. 580
  6. 416
  7. 240
  8. 208
  9. 304
  10. 240
  11. 372
  12. 480
  13. 104
  14. 368
  15. 216
  16. 264
  17. 548
  18. 256
  19. 544
  20. 632
  21. 176
  22. 396
  23. 436
  24. 480
  25. 68
  26. 432
  27. 180
  28. 380
  29. 376
  30. 312
  31. 264
  32. 152
  33. 372
  34. 240
  35. 456
  36. 432
  37. 176
  38. 76
  39. 160
  40. 168

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