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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 393 · 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. 1.87 × 4 =
  2. 2.32 × 8 =
  3. 3.87 × 4 =
  4. 4.44 × 8 =
  5. 5.151 × 4 =
  6. 6.46 × 8 =
  7. 7.47 × 8 =
  8. 8.61 × 8 =
  9. 9.50 × 8 =
  10. 10.21 × 4 =
  11. 11.139 × 4 =
  12. 12.74 × 8 =
  13. 13.59 × 8 =
  14. 14.132 × 4 =
  15. 15.86 × 4 =
  16. 16.116 × 4 =
  17. 17.64 × 4 =
  18. 18.125 × 4 =
  19. 19.108 × 4 =
  20. 20.21 × 4 =
  21. 21.68 × 8 =
  22. 22.15 × 8 =
  23. 23.23 × 8 =
  24. 24.134 × 4 =
  25. 25.14 × 8 =
  26. 26.103 × 4 =
  27. 27.53 × 8 =
  28. 28.41 × 8 =
  29. 29.67 × 8 =
  30. 30.54 × 8 =
  31. 31.93 × 4 =
  32. 32.27 × 8 =
  33. 33.38 × 8 =
  34. 34.116 × 4 =
  35. 35.16 × 4 =
  36. 36.66 × 4 =
  37. 37.38 × 8 =
  38. 38.114 × 4 =
  39. 39.143 × 4 =
  40. 40.149 × 4 =

Answer key

  1. 348
  2. 256
  3. 348
  4. 352
  5. 604
  6. 368
  7. 376
  8. 488
  9. 400
  10. 84
  11. 556
  12. 592
  13. 472
  14. 528
  15. 344
  16. 464
  17. 256
  18. 500
  19. 432
  20. 84
  21. 544
  22. 120
  23. 184
  24. 536
  25. 112
  26. 412
  27. 424
  28. 328
  29. 536
  30. 432
  31. 372
  32. 216
  33. 304
  34. 464
  35. 64
  36. 264
  37. 304
  38. 456
  39. 572
  40. 596

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