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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 534 · 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. 1.84 × 4 =
  2. 2.21 × 8 =
  3. 3.158 × 4 =
  4. 4.82 × 4 =
  5. 5.51 × 8 =
  6. 6.25 × 4 =
  7. 7.66 × 4 =
  8. 8.22 × 8 =
  9. 9.157 × 4 =
  10. 10.36 × 8 =
  11. 11.25 × 4 =
  12. 12.13 × 8 =
  13. 13.54 × 8 =
  14. 14.159 × 4 =
  15. 15.41 × 8 =
  16. 16.112 × 4 =
  17. 17.132 × 4 =
  18. 18.110 × 4 =
  19. 19.41 × 8 =
  20. 20.23 × 4 =
  21. 21.17 × 8 =
  22. 22.100 × 4 =
  23. 23.26 × 8 =
  24. 24.30 × 4 =
  25. 25.103 × 4 =
  26. 26.64 × 8 =
  27. 27.118 × 4 =
  28. 28.72 × 4 =
  29. 29.101 × 4 =
  30. 30.57 × 8 =
  31. 31.38 × 8 =
  32. 32.139 × 4 =
  33. 33.16 × 4 =
  34. 34.149 × 4 =
  35. 35.72 × 8 =
  36. 36.35 × 8 =
  37. 37.154 × 4 =
  38. 38.21 × 8 =
  39. 39.87 × 4 =
  40. 40.141 × 4 =

Answer key

  1. 336
  2. 168
  3. 632
  4. 328
  5. 408
  6. 100
  7. 264
  8. 176
  9. 628
  10. 288
  11. 100
  12. 104
  13. 432
  14. 636
  15. 328
  16. 448
  17. 528
  18. 440
  19. 328
  20. 92
  21. 136
  22. 400
  23. 208
  24. 120
  25. 412
  26. 512
  27. 472
  28. 288
  29. 404
  30. 456
  31. 304
  32. 556
  33. 64
  34. 596
  35. 576
  36. 280
  37. 616
  38. 168
  39. 348
  40. 564

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