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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 830 · 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. 1.59 × 8 =
  2. 2.25 × 4 =
  3. 3.42 × 8 =
  4. 4.73 × 4 =
  5. 5.65 × 8 =
  6. 6.63 × 8 =
  7. 7.44 × 4 =
  8. 8.50 × 8 =
  9. 9.33 × 8 =
  10. 10.118 × 4 =
  11. 11.112 × 4 =
  12. 12.136 × 4 =
  13. 13.148 × 4 =
  14. 14.30 × 8 =
  15. 15.71 × 4 =
  16. 16.72 × 8 =
  17. 17.61 × 8 =
  18. 18.36 × 4 =
  19. 19.79 × 4 =
  20. 20.52 × 4 =
  21. 21.24 × 8 =
  22. 22.16 × 4 =
  23. 23.116 × 4 =
  24. 24.87 × 4 =
  25. 25.123 × 4 =
  26. 26.92 × 4 =
  27. 27.71 × 8 =
  28. 28.147 × 4 =
  29. 29.66 × 8 =
  30. 30.36 × 8 =
  31. 31.64 × 8 =
  32. 32.76 × 4 =
  33. 33.46 × 8 =
  34. 34.39 × 8 =
  35. 35.137 × 4 =
  36. 36.53 × 4 =
  37. 37.13 × 8 =
  38. 38.23 × 8 =
  39. 39.51 × 4 =
  40. 40.87 × 4 =

Answer key

  1. 472
  2. 100
  3. 336
  4. 292
  5. 520
  6. 504
  7. 176
  8. 400
  9. 264
  10. 472
  11. 448
  12. 544
  13. 592
  14. 240
  15. 284
  16. 576
  17. 488
  18. 144
  19. 316
  20. 208
  21. 192
  22. 64
  23. 464
  24. 348
  25. 492
  26. 368
  27. 568
  28. 588
  29. 528
  30. 288
  31. 512
  32. 304
  33. 368
  34. 312
  35. 548
  36. 212
  37. 104
  38. 184
  39. 204
  40. 348

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