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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 360 · 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. 1.154 × 4 =
  2. 2.136 × 4 =
  3. 3.64 × 8 =
  4. 4.31 × 4 =
  5. 5.153 × 4 =
  6. 6.20 × 8 =
  7. 7.49 × 8 =
  8. 8.100 × 4 =
  9. 9.65 × 4 =
  10. 10.14 × 8 =
  11. 11.39 × 8 =
  12. 12.14 × 8 =
  13. 13.117 × 4 =
  14. 14.47 × 4 =
  15. 15.50 × 8 =
  16. 16.43 × 8 =
  17. 17.37 × 8 =
  18. 18.42 × 8 =
  19. 19.54 × 8 =
  20. 20.18 × 8 =
  21. 21.31 × 4 =
  22. 22.53 × 8 =
  23. 23.103 × 4 =
  24. 24.36 × 8 =
  25. 25.37 × 4 =
  26. 26.123 × 4 =
  27. 27.53 × 4 =
  28. 28.72 × 8 =
  29. 29.33 × 8 =
  30. 30.38 × 4 =
  31. 31.90 × 4 =
  32. 32.18 × 8 =
  33. 33.46 × 8 =
  34. 34.129 × 4 =
  35. 35.147 × 4 =
  36. 36.88 × 4 =
  37. 37.64 × 8 =
  38. 38.156 × 4 =
  39. 39.28 × 8 =
  40. 40.52 × 8 =

Answer key

  1. 616
  2. 544
  3. 512
  4. 124
  5. 612
  6. 160
  7. 392
  8. 400
  9. 260
  10. 112
  11. 312
  12. 112
  13. 468
  14. 188
  15. 400
  16. 344
  17. 296
  18. 336
  19. 432
  20. 144
  21. 124
  22. 424
  23. 412
  24. 288
  25. 148
  26. 492
  27. 212
  28. 576
  29. 264
  30. 152
  31. 360
  32. 144
  33. 368
  34. 516
  35. 588
  36. 352
  37. 512
  38. 624
  39. 224
  40. 416

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