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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 716 · 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. 1.143 × 4 =
  2. 2.36 × 4 =
  3. 3.42 × 4 =
  4. 4.21 × 8 =
  5. 5.44 × 4 =
  6. 6.42 × 4 =
  7. 7.135 × 4 =
  8. 8.74 × 8 =
  9. 9.82 × 4 =
  10. 10.35 × 4 =
  11. 11.134 × 4 =
  12. 12.40 × 4 =
  13. 13.146 × 4 =
  14. 14.20 × 8 =
  15. 15.123 × 4 =
  16. 16.38 × 8 =
  17. 17.52 × 4 =
  18. 18.42 × 4 =
  19. 19.147 × 4 =
  20. 20.74 × 8 =
  21. 21.42 × 8 =
  22. 22.28 × 4 =
  23. 23.108 × 4 =
  24. 24.49 × 8 =
  25. 25.27 × 8 =
  26. 26.75 × 4 =
  27. 27.72 × 4 =
  28. 28.59 × 4 =
  29. 29.19 × 8 =
  30. 30.96 × 4 =
  31. 31.122 × 4 =
  32. 32.42 × 8 =
  33. 33.59 × 8 =
  34. 34.138 × 4 =
  35. 35.32 × 8 =
  36. 36.53 × 8 =
  37. 37.21 × 4 =
  38. 38.85 × 4 =
  39. 39.34 × 8 =
  40. 40.71 × 8 =

Answer key

  1. 572
  2. 144
  3. 168
  4. 168
  5. 176
  6. 168
  7. 540
  8. 592
  9. 328
  10. 140
  11. 536
  12. 160
  13. 584
  14. 160
  15. 492
  16. 304
  17. 208
  18. 168
  19. 588
  20. 592
  21. 336
  22. 112
  23. 432
  24. 392
  25. 216
  26. 300
  27. 288
  28. 236
  29. 152
  30. 384
  31. 488
  32. 336
  33. 472
  34. 552
  35. 256
  36. 424
  37. 84
  38. 340
  39. 272
  40. 568

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