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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 377 · 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. 1.91 × 4 =
  2. 2.18 × 8 =
  3. 3.43 × 8 =
  4. 4.119 × 4 =
  5. 5.19 × 8 =
  6. 6.44 × 8 =
  7. 7.16 × 8 =
  8. 8.156 × 4 =
  9. 9.69 × 8 =
  10. 10.15 × 4 =
  11. 11.82 × 4 =
  12. 12.65 × 8 =
  13. 13.29 × 8 =
  14. 14.142 × 4 =
  15. 15.62 × 4 =
  16. 16.16 × 8 =
  17. 17.51 × 8 =
  18. 18.73 × 8 =
  19. 19.70 × 8 =
  20. 20.87 × 4 =
  21. 21.134 × 4 =
  22. 22.108 × 4 =
  23. 23.36 × 8 =
  24. 24.40 × 8 =
  25. 25.43 × 4 =
  26. 26.55 × 4 =
  27. 27.34 × 4 =
  28. 28.30 × 8 =
  29. 29.16 × 8 =
  30. 30.70 × 8 =
  31. 31.41 × 8 =
  32. 32.32 × 8 =
  33. 33.22 × 4 =
  34. 34.69 × 8 =
  35. 35.26 × 8 =
  36. 36.30 × 8 =
  37. 37.54 × 4 =
  38. 38.131 × 4 =
  39. 39.37 × 4 =
  40. 40.114 × 4 =

Answer key

  1. 364
  2. 144
  3. 344
  4. 476
  5. 152
  6. 352
  7. 128
  8. 624
  9. 552
  10. 60
  11. 328
  12. 520
  13. 232
  14. 568
  15. 248
  16. 128
  17. 408
  18. 584
  19. 560
  20. 348
  21. 536
  22. 432
  23. 288
  24. 320
  25. 172
  26. 220
  27. 136
  28. 240
  29. 128
  30. 560
  31. 328
  32. 256
  33. 88
  34. 552
  35. 208
  36. 240
  37. 216
  38. 524
  39. 148
  40. 456

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