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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 35 · 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. 1.139 × 4 =
  2. 2.45 × 4 =
  3. 3.101 × 4 =
  4. 4.108 × 4 =
  5. 5.16 × 8 =
  6. 6.140 × 4 =
  7. 7.34 × 4 =
  8. 8.151 × 4 =
  9. 9.67 × 4 =
  10. 10.71 × 4 =
  11. 11.139 × 4 =
  12. 12.78 × 4 =
  13. 13.12 × 8 =
  14. 14.88 × 4 =
  15. 15.35 × 8 =
  16. 16.96 × 4 =
  17. 17.92 × 4 =
  18. 18.30 × 8 =
  19. 19.21 × 4 =
  20. 20.99 × 4 =
  21. 21.34 × 8 =
  22. 22.52 × 4 =
  23. 23.92 × 4 =
  24. 24.115 × 4 =
  25. 25.47 × 4 =
  26. 26.104 × 4 =
  27. 27.38 × 8 =
  28. 28.38 × 8 =
  29. 29.48 × 8 =
  30. 30.59 × 8 =
  31. 31.48 × 8 =
  32. 32.40 × 8 =
  33. 33.41 × 8 =
  34. 34.144 × 4 =
  35. 35.51 × 8 =
  36. 36.97 × 4 =
  37. 37.33 × 4 =
  38. 38.59 × 8 =
  39. 39.142 × 4 =
  40. 40.57 × 8 =

Answer key

  1. 556
  2. 180
  3. 404
  4. 432
  5. 128
  6. 560
  7. 136
  8. 604
  9. 268
  10. 284
  11. 556
  12. 312
  13. 96
  14. 352
  15. 280
  16. 384
  17. 368
  18. 240
  19. 84
  20. 396
  21. 272
  22. 208
  23. 368
  24. 460
  25. 188
  26. 416
  27. 304
  28. 304
  29. 384
  30. 472
  31. 384
  32. 320
  33. 328
  34. 576
  35. 408
  36. 388
  37. 132
  38. 472
  39. 568
  40. 456

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