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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 583 · 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. 1.17 × 8 =
  2. 2.63 × 4 =
  3. 3.50 × 8 =
  4. 4.40 × 4 =
  5. 5.128 × 4 =
  6. 6.30 × 4 =
  7. 7.68 × 8 =
  8. 8.51 × 8 =
  9. 9.141 × 4 =
  10. 10.45 × 4 =
  11. 11.70 × 8 =
  12. 12.51 × 4 =
  13. 13.121 × 4 =
  14. 14.131 × 4 =
  15. 15.54 × 8 =
  16. 16.61 × 8 =
  17. 17.117 × 4 =
  18. 18.123 × 4 =
  19. 19.55 × 8 =
  20. 20.59 × 4 =
  21. 21.61 × 8 =
  22. 22.82 × 4 =
  23. 23.65 × 8 =
  24. 24.80 × 4 =
  25. 25.85 × 4 =
  26. 26.51 × 8 =
  27. 27.45 × 4 =
  28. 28.32 × 4 =
  29. 29.149 × 4 =
  30. 30.63 × 8 =
  31. 31.151 × 4 =
  32. 32.56 × 8 =
  33. 33.116 × 4 =
  34. 34.48 × 8 =
  35. 35.55 × 8 =
  36. 36.118 × 4 =
  37. 37.75 × 8 =
  38. 38.118 × 4 =
  39. 39.47 × 8 =
  40. 40.75 × 8 =

Answer key

  1. 136
  2. 252
  3. 400
  4. 160
  5. 512
  6. 120
  7. 544
  8. 408
  9. 564
  10. 180
  11. 560
  12. 204
  13. 484
  14. 524
  15. 432
  16. 488
  17. 468
  18. 492
  19. 440
  20. 236
  21. 488
  22. 328
  23. 520
  24. 320
  25. 340
  26. 408
  27. 180
  28. 128
  29. 596
  30. 504
  31. 604
  32. 448
  33. 464
  34. 384
  35. 440
  36. 472
  37. 600
  38. 472
  39. 376
  40. 600

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