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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 506 · 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. 1.38 × 8 =
  2. 2.57 × 8 =
  3. 3.42 × 8 =
  4. 4.21 × 8 =
  5. 5.32 × 8 =
  6. 6.40 × 4 =
  7. 7.64 × 4 =
  8. 8.151 × 4 =
  9. 9.44 × 8 =
  10. 10.21 × 4 =
  11. 11.44 × 4 =
  12. 12.156 × 4 =
  13. 13.150 × 4 =
  14. 14.15 × 8 =
  15. 15.60 × 4 =
  16. 16.52 × 8 =
  17. 17.93 × 4 =
  18. 18.122 × 4 =
  19. 19.90 × 4 =
  20. 20.97 × 4 =
  21. 21.111 × 4 =
  22. 22.70 × 4 =
  23. 23.51 × 8 =
  24. 24.17 × 4 =
  25. 25.40 × 4 =
  26. 26.24 × 8 =
  27. 27.91 × 4 =
  28. 28.111 × 4 =
  29. 29.66 × 8 =
  30. 30.60 × 4 =
  31. 31.106 × 4 =
  32. 32.45 × 8 =
  33. 33.44 × 4 =
  34. 34.136 × 4 =
  35. 35.69 × 8 =
  36. 36.127 × 4 =
  37. 37.99 × 4 =
  38. 38.75 × 8 =
  39. 39.52 × 4 =
  40. 40.27 × 8 =

Answer key

  1. 304
  2. 456
  3. 336
  4. 168
  5. 256
  6. 160
  7. 256
  8. 604
  9. 352
  10. 84
  11. 176
  12. 624
  13. 600
  14. 120
  15. 240
  16. 416
  17. 372
  18. 488
  19. 360
  20. 388
  21. 444
  22. 280
  23. 408
  24. 68
  25. 160
  26. 192
  27. 364
  28. 444
  29. 528
  30. 240
  31. 424
  32. 360
  33. 176
  34. 544
  35. 552
  36. 508
  37. 396
  38. 600
  39. 208
  40. 216

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