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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 478 · 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. 1.155 × 4 =
  2. 2.38 × 4 =
  3. 3.15 × 8 =
  4. 4.28 × 4 =
  5. 5.57 × 8 =
  6. 6.52 × 8 =
  7. 7.56 × 4 =
  8. 8.111 × 4 =
  9. 9.74 × 8 =
  10. 10.128 × 4 =
  11. 11.39 × 4 =
  12. 12.19 × 4 =
  13. 13.126 × 4 =
  14. 14.28 × 4 =
  15. 15.62 × 4 =
  16. 16.53 × 8 =
  17. 17.46 × 4 =
  18. 18.85 × 4 =
  19. 19.93 × 4 =
  20. 20.58 × 4 =
  21. 21.47 × 8 =
  22. 22.16 × 8 =
  23. 23.41 × 4 =
  24. 24.158 × 4 =
  25. 25.44 × 8 =
  26. 26.99 × 4 =
  27. 27.19 × 8 =
  28. 28.58 × 4 =
  29. 29.70 × 8 =
  30. 30.38 × 4 =
  31. 31.81 × 4 =
  32. 32.43 × 4 =
  33. 33.61 × 8 =
  34. 34.23 × 4 =
  35. 35.147 × 4 =
  36. 36.43 × 8 =
  37. 37.154 × 4 =
  38. 38.151 × 4 =
  39. 39.48 × 8 =
  40. 40.61 × 4 =

Answer key

  1. 620
  2. 152
  3. 120
  4. 112
  5. 456
  6. 416
  7. 224
  8. 444
  9. 592
  10. 512
  11. 156
  12. 76
  13. 504
  14. 112
  15. 248
  16. 424
  17. 184
  18. 340
  19. 372
  20. 232
  21. 376
  22. 128
  23. 164
  24. 632
  25. 352
  26. 396
  27. 152
  28. 232
  29. 560
  30. 152
  31. 324
  32. 172
  33. 488
  34. 92
  35. 588
  36. 344
  37. 616
  38. 604
  39. 384
  40. 244

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