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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 345 · 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. 1.152 × 4 =
  2. 2.120 × 4 =
  3. 3.19 × 4 =
  4. 4.53 × 8 =
  5. 5.154 × 4 =
  6. 6.71 × 4 =
  7. 7.147 × 4 =
  8. 8.15 × 4 =
  9. 9.40 × 4 =
  10. 10.73 × 4 =
  11. 11.83 × 4 =
  12. 12.40 × 4 =
  13. 13.45 × 8 =
  14. 14.26 × 4 =
  15. 15.83 × 4 =
  16. 16.45 × 4 =
  17. 17.72 × 8 =
  18. 18.64 × 8 =
  19. 19.99 × 4 =
  20. 20.26 × 8 =
  21. 21.47 × 8 =
  22. 22.134 × 4 =
  23. 23.35 × 8 =
  24. 24.57 × 8 =
  25. 25.65 × 8 =
  26. 26.56 × 8 =
  27. 27.23 × 8 =
  28. 28.53 × 4 =
  29. 29.58 × 8 =
  30. 30.19 × 4 =
  31. 31.29 × 8 =
  32. 32.101 × 4 =
  33. 33.73 × 8 =
  34. 34.53 × 8 =
  35. 35.62 × 8 =
  36. 36.42 × 4 =
  37. 37.35 × 4 =
  38. 38.48 × 4 =
  39. 39.63 × 8 =
  40. 40.54 × 8 =

Answer key

  1. 608
  2. 480
  3. 76
  4. 424
  5. 616
  6. 284
  7. 588
  8. 60
  9. 160
  10. 292
  11. 332
  12. 160
  13. 360
  14. 104
  15. 332
  16. 180
  17. 576
  18. 512
  19. 396
  20. 208
  21. 376
  22. 536
  23. 280
  24. 456
  25. 520
  26. 448
  27. 184
  28. 212
  29. 464
  30. 76
  31. 232
  32. 404
  33. 584
  34. 424
  35. 496
  36. 168
  37. 140
  38. 192
  39. 504
  40. 432

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