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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 223 · 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. 1.33 × 8 =
  2. 2.114 × 4 =
  3. 3.52 × 4 =
  4. 4.60 × 4 =
  5. 5.15 × 8 =
  6. 6.48 × 8 =
  7. 7.72 × 8 =
  8. 8.45 × 4 =
  9. 9.13 × 4 =
  10. 10.113 × 4 =
  11. 11.119 × 4 =
  12. 12.71 × 4 =
  13. 13.37 × 8 =
  14. 14.46 × 8 =
  15. 15.37 × 8 =
  16. 16.99 × 4 =
  17. 17.58 × 8 =
  18. 18.63 × 4 =
  19. 19.42 × 8 =
  20. 20.150 × 4 =
  21. 21.40 × 4 =
  22. 22.40 × 8 =
  23. 23.42 × 8 =
  24. 24.80 × 4 =
  25. 25.22 × 4 =
  26. 26.147 × 4 =
  27. 27.22 × 8 =
  28. 28.134 × 4 =
  29. 29.15 × 8 =
  30. 30.99 × 4 =
  31. 31.74 × 8 =
  32. 32.79 × 4 =
  33. 33.43 × 8 =
  34. 34.105 × 4 =
  35. 35.21 × 8 =
  36. 36.14 × 4 =
  37. 37.51 × 8 =
  38. 38.71 × 8 =
  39. 39.52 × 4 =
  40. 40.96 × 4 =

Answer key

  1. 264
  2. 456
  3. 208
  4. 240
  5. 120
  6. 384
  7. 576
  8. 180
  9. 52
  10. 452
  11. 476
  12. 284
  13. 296
  14. 368
  15. 296
  16. 396
  17. 464
  18. 252
  19. 336
  20. 600
  21. 160
  22. 320
  23. 336
  24. 320
  25. 88
  26. 588
  27. 176
  28. 536
  29. 120
  30. 396
  31. 592
  32. 316
  33. 344
  34. 420
  35. 168
  36. 56
  37. 408
  38. 568
  39. 208
  40. 384

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