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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 349 · 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. 1.35 × 8 =
  2. 2.129 × 4 =
  3. 3.126 × 4 =
  4. 4.41 × 8 =
  5. 5.30 × 8 =
  6. 6.38 × 4 =
  7. 7.16 × 8 =
  8. 8.147 × 4 =
  9. 9.50 × 8 =
  10. 10.114 × 4 =
  11. 11.154 × 4 =
  12. 12.29 × 8 =
  13. 13.43 × 8 =
  14. 14.89 × 4 =
  15. 15.19 × 4 =
  16. 16.40 × 8 =
  17. 17.105 × 4 =
  18. 18.21 × 8 =
  19. 19.74 × 8 =
  20. 20.129 × 4 =
  21. 21.46 × 4 =
  22. 22.55 × 4 =
  23. 23.74 × 8 =
  24. 24.87 × 4 =
  25. 25.34 × 4 =
  26. 26.157 × 4 =
  27. 27.15 × 4 =
  28. 28.38 × 4 =
  29. 29.37 × 8 =
  30. 30.68 × 4 =
  31. 31.26 × 8 =
  32. 32.46 × 4 =
  33. 33.30 × 8 =
  34. 34.38 × 4 =
  35. 35.124 × 4 =
  36. 36.123 × 4 =
  37. 37.46 × 8 =
  38. 38.84 × 4 =
  39. 39.28 × 8 =
  40. 40.158 × 4 =

Answer key

  1. 280
  2. 516
  3. 504
  4. 328
  5. 240
  6. 152
  7. 128
  8. 588
  9. 400
  10. 456
  11. 616
  12. 232
  13. 344
  14. 356
  15. 76
  16. 320
  17. 420
  18. 168
  19. 592
  20. 516
  21. 184
  22. 220
  23. 592
  24. 348
  25. 136
  26. 628
  27. 60
  28. 152
  29. 296
  30. 272
  31. 208
  32. 184
  33. 240
  34. 152
  35. 496
  36. 492
  37. 368
  38. 336
  39. 224
  40. 632

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