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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 379 · 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. 1.54 × 8 =
  2. 2.15 × 8 =
  3. 3.102 × 4 =
  4. 4.21 × 8 =
  5. 5.25 × 8 =
  6. 6.139 × 4 =
  7. 7.61 × 4 =
  8. 8.104 × 4 =
  9. 9.75 × 8 =
  10. 10.67 × 4 =
  11. 11.27 × 8 =
  12. 12.35 × 8 =
  13. 13.80 × 4 =
  14. 14.28 × 8 =
  15. 15.36 × 8 =
  16. 16.39 × 8 =
  17. 17.39 × 8 =
  18. 18.13 × 8 =
  19. 19.157 × 4 =
  20. 20.65 × 4 =
  21. 21.15 × 8 =
  22. 22.69 × 8 =
  23. 23.68 × 8 =
  24. 24.74 × 8 =
  25. 25.98 × 4 =
  26. 26.75 × 8 =
  27. 27.33 × 8 =
  28. 28.137 × 4 =
  29. 29.27 × 4 =
  30. 30.108 × 4 =
  31. 31.94 × 4 =
  32. 32.29 × 8 =
  33. 33.84 × 4 =
  34. 34.47 × 8 =
  35. 35.82 × 4 =
  36. 36.16 × 8 =
  37. 37.64 × 8 =
  38. 38.52 × 4 =
  39. 39.23 × 8 =
  40. 40.116 × 4 =

Answer key

  1. 432
  2. 120
  3. 408
  4. 168
  5. 200
  6. 556
  7. 244
  8. 416
  9. 600
  10. 268
  11. 216
  12. 280
  13. 320
  14. 224
  15. 288
  16. 312
  17. 312
  18. 104
  19. 628
  20. 260
  21. 120
  22. 552
  23. 544
  24. 592
  25. 392
  26. 600
  27. 264
  28. 548
  29. 108
  30. 432
  31. 376
  32. 232
  33. 336
  34. 376
  35. 328
  36. 128
  37. 512
  38. 208
  39. 184
  40. 464

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