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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 344 · 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. 1.115 × 4 =
  2. 2.99 × 4 =
  3. 3.21 × 8 =
  4. 4.74 × 4 =
  5. 5.98 × 4 =
  6. 6.35 × 8 =
  7. 7.77 × 4 =
  8. 8.137 × 4 =
  9. 9.159 × 4 =
  10. 10.62 × 8 =
  11. 11.43 × 4 =
  12. 12.129 × 4 =
  13. 13.71 × 4 =
  14. 14.43 × 8 =
  15. 15.32 × 8 =
  16. 16.139 × 4 =
  17. 17.26 × 4 =
  18. 18.67 × 4 =
  19. 19.115 × 4 =
  20. 20.51 × 8 =
  21. 21.43 × 8 =
  22. 22.53 × 4 =
  23. 23.52 × 8 =
  24. 24.119 × 4 =
  25. 25.38 × 8 =
  26. 26.129 × 4 =
  27. 27.66 × 4 =
  28. 28.146 × 4 =
  29. 29.126 × 4 =
  30. 30.68 × 8 =
  31. 31.87 × 4 =
  32. 32.55 × 8 =
  33. 33.61 × 4 =
  34. 34.27 × 8 =
  35. 35.31 × 8 =
  36. 36.20 × 8 =
  37. 37.100 × 4 =
  38. 38.91 × 4 =
  39. 39.42 × 8 =
  40. 40.16 × 8 =

Answer key

  1. 460
  2. 396
  3. 168
  4. 296
  5. 392
  6. 280
  7. 308
  8. 548
  9. 636
  10. 496
  11. 172
  12. 516
  13. 284
  14. 344
  15. 256
  16. 556
  17. 104
  18. 268
  19. 460
  20. 408
  21. 344
  22. 212
  23. 416
  24. 476
  25. 304
  26. 516
  27. 264
  28. 584
  29. 504
  30. 544
  31. 348
  32. 440
  33. 244
  34. 216
  35. 248
  36. 160
  37. 400
  38. 364
  39. 336
  40. 128

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