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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 809 · 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. 1.71 × 4 =
  2. 2.20 × 8 =
  3. 3.52 × 8 =
  4. 4.87 × 4 =
  5. 5.24 × 4 =
  6. 6.149 × 4 =
  7. 7.13 × 8 =
  8. 8.18 × 8 =
  9. 9.124 × 4 =
  10. 10.72 × 8 =
  11. 11.83 × 4 =
  12. 12.31 × 8 =
  13. 13.106 × 4 =
  14. 14.45 × 4 =
  15. 15.54 × 8 =
  16. 16.62 × 8 =
  17. 17.51 × 8 =
  18. 18.155 × 4 =
  19. 19.58 × 8 =
  20. 20.31 × 8 =
  21. 21.128 × 4 =
  22. 22.142 × 4 =
  23. 23.60 × 8 =
  24. 24.106 × 4 =
  25. 25.50 × 8 =
  26. 26.68 × 8 =
  27. 27.19 × 8 =
  28. 28.121 × 4 =
  29. 29.20 × 4 =
  30. 30.13 × 8 =
  31. 31.82 × 4 =
  32. 32.21 × 4 =
  33. 33.21 × 4 =
  34. 34.155 × 4 =
  35. 35.72 × 4 =
  36. 36.154 × 4 =
  37. 37.133 × 4 =
  38. 38.153 × 4 =
  39. 39.73 × 4 =
  40. 40.80 × 4 =

Answer key

  1. 284
  2. 160
  3. 416
  4. 348
  5. 96
  6. 596
  7. 104
  8. 144
  9. 496
  10. 576
  11. 332
  12. 248
  13. 424
  14. 180
  15. 432
  16. 496
  17. 408
  18. 620
  19. 464
  20. 248
  21. 512
  22. 568
  23. 480
  24. 424
  25. 400
  26. 544
  27. 152
  28. 484
  29. 80
  30. 104
  31. 328
  32. 84
  33. 84
  34. 620
  35. 288
  36. 616
  37. 532
  38. 612
  39. 292
  40. 320

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