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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 451 · 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. 1.71 × 8 =
  2. 2.46 × 4 =
  3. 3.23 × 8 =
  4. 4.49 × 8 =
  5. 5.133 × 4 =
  6. 6.148 × 4 =
  7. 7.42 × 4 =
  8. 8.114 × 4 =
  9. 9.73 × 8 =
  10. 10.13 × 8 =
  11. 11.159 × 4 =
  12. 12.66 × 8 =
  13. 13.37 × 8 =
  14. 14.69 × 8 =
  15. 15.61 × 8 =
  16. 16.29 × 4 =
  17. 17.28 × 8 =
  18. 18.91 × 4 =
  19. 19.136 × 4 =
  20. 20.135 × 4 =
  21. 21.34 × 8 =
  22. 22.69 × 8 =
  23. 23.41 × 8 =
  24. 24.96 × 4 =
  25. 25.56 × 4 =
  26. 26.54 × 8 =
  27. 27.139 × 4 =
  28. 28.32 × 4 =
  29. 29.23 × 8 =
  30. 30.91 × 4 =
  31. 31.128 × 4 =
  32. 32.43 × 4 =
  33. 33.68 × 4 =
  34. 34.70 × 8 =
  35. 35.119 × 4 =
  36. 36.106 × 4 =
  37. 37.48 × 8 =
  38. 38.13 × 4 =
  39. 39.39 × 4 =
  40. 40.46 × 4 =

Answer key

  1. 568
  2. 184
  3. 184
  4. 392
  5. 532
  6. 592
  7. 168
  8. 456
  9. 584
  10. 104
  11. 636
  12. 528
  13. 296
  14. 552
  15. 488
  16. 116
  17. 224
  18. 364
  19. 544
  20. 540
  21. 272
  22. 552
  23. 328
  24. 384
  25. 224
  26. 432
  27. 556
  28. 128
  29. 184
  30. 364
  31. 512
  32. 172
  33. 272
  34. 560
  35. 476
  36. 424
  37. 384
  38. 52
  39. 156
  40. 184

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