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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 241 · 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. 1.81 × 4 =
  2. 2.53 × 4 =
  3. 3.21 × 4 =
  4. 4.74 × 8 =
  5. 5.48 × 4 =
  6. 6.73 × 8 =
  7. 7.20 × 8 =
  8. 8.17 × 8 =
  9. 9.16 × 4 =
  10. 10.129 × 4 =
  11. 11.61 × 8 =
  12. 12.22 × 8 =
  13. 13.45 × 4 =
  14. 14.16 × 8 =
  15. 15.56 × 8 =
  16. 16.22 × 8 =
  17. 17.44 × 4 =
  18. 18.137 × 4 =
  19. 19.70 × 8 =
  20. 20.63 × 4 =
  21. 21.93 × 4 =
  22. 22.43 × 8 =
  23. 23.115 × 4 =
  24. 24.53 × 4 =
  25. 25.59 × 8 =
  26. 26.72 × 8 =
  27. 27.123 × 4 =
  28. 28.69 × 4 =
  29. 29.70 × 8 =
  30. 30.54 × 8 =
  31. 31.16 × 8 =
  32. 32.26 × 8 =
  33. 33.44 × 8 =
  34. 34.74 × 8 =
  35. 35.73 × 8 =
  36. 36.17 × 8 =
  37. 37.88 × 4 =
  38. 38.131 × 4 =
  39. 39.155 × 4 =
  40. 40.79 × 4 =

Answer key

  1. 324
  2. 212
  3. 84
  4. 592
  5. 192
  6. 584
  7. 160
  8. 136
  9. 64
  10. 516
  11. 488
  12. 176
  13. 180
  14. 128
  15. 448
  16. 176
  17. 176
  18. 548
  19. 560
  20. 252
  21. 372
  22. 344
  23. 460
  24. 212
  25. 472
  26. 576
  27. 492
  28. 276
  29. 560
  30. 432
  31. 128
  32. 208
  33. 352
  34. 592
  35. 584
  36. 136
  37. 352
  38. 524
  39. 620
  40. 316

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