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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 298 · 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. 1.78 × 4 =
  2. 2.95 × 4 =
  3. 3.16 × 8 =
  4. 4.56 × 8 =
  5. 5.30 × 4 =
  6. 6.41 × 8 =
  7. 7.39 × 8 =
  8. 8.56 × 8 =
  9. 9.38 × 4 =
  10. 10.158 × 4 =
  11. 11.21 × 4 =
  12. 12.52 × 8 =
  13. 13.14 × 8 =
  14. 14.154 × 4 =
  15. 15.17 × 8 =
  16. 16.74 × 8 =
  17. 17.57 × 8 =
  18. 18.49 × 4 =
  19. 19.29 × 8 =
  20. 20.35 × 4 =
  21. 21.15 × 8 =
  22. 22.29 × 8 =
  23. 23.78 × 4 =
  24. 24.60 × 8 =
  25. 25.46 × 4 =
  26. 26.55 × 8 =
  27. 27.64 × 4 =
  28. 28.12 × 8 =
  29. 29.29 × 8 =
  30. 30.40 × 8 =
  31. 31.47 × 4 =
  32. 32.102 × 4 =
  33. 33.98 × 4 =
  34. 34.60 × 8 =
  35. 35.21 × 4 =
  36. 36.43 × 8 =
  37. 37.41 × 8 =
  38. 38.129 × 4 =
  39. 39.31 × 4 =
  40. 40.52 × 8 =

Answer key

  1. 312
  2. 380
  3. 128
  4. 448
  5. 120
  6. 328
  7. 312
  8. 448
  9. 152
  10. 632
  11. 84
  12. 416
  13. 112
  14. 616
  15. 136
  16. 592
  17. 456
  18. 196
  19. 232
  20. 140
  21. 120
  22. 232
  23. 312
  24. 480
  25. 184
  26. 440
  27. 256
  28. 96
  29. 232
  30. 320
  31. 188
  32. 408
  33. 392
  34. 480
  35. 84
  36. 344
  37. 328
  38. 516
  39. 124
  40. 416

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