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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 510 · 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. 1.155 × 4 =
  2. 2.44 × 8 =
  3. 3.17 × 8 =
  4. 4.13 × 8 =
  5. 5.72 × 8 =
  6. 6.142 × 4 =
  7. 7.156 × 4 =
  8. 8.100 × 4 =
  9. 9.56 × 8 =
  10. 10.23 × 4 =
  11. 11.118 × 4 =
  12. 12.137 × 4 =
  13. 13.15 × 8 =
  14. 14.68 × 4 =
  15. 15.74 × 4 =
  16. 16.128 × 4 =
  17. 17.61 × 8 =
  18. 18.81 × 4 =
  19. 19.36 × 4 =
  20. 20.115 × 4 =
  21. 21.72 × 8 =
  22. 22.53 × 8 =
  23. 23.83 × 4 =
  24. 24.15 × 4 =
  25. 25.38 × 4 =
  26. 26.118 × 4 =
  27. 27.42 × 8 =
  28. 28.46 × 8 =
  29. 29.63 × 8 =
  30. 30.56 × 8 =
  31. 31.60 × 4 =
  32. 32.46 × 8 =
  33. 33.103 × 4 =
  34. 34.44 × 4 =
  35. 35.65 × 8 =
  36. 36.13 × 4 =
  37. 37.49 × 8 =
  38. 38.62 × 8 =
  39. 39.109 × 4 =
  40. 40.72 × 4 =

Answer key

  1. 620
  2. 352
  3. 136
  4. 104
  5. 576
  6. 568
  7. 624
  8. 400
  9. 448
  10. 92
  11. 472
  12. 548
  13. 120
  14. 272
  15. 296
  16. 512
  17. 488
  18. 324
  19. 144
  20. 460
  21. 576
  22. 424
  23. 332
  24. 60
  25. 152
  26. 472
  27. 336
  28. 368
  29. 504
  30. 448
  31. 240
  32. 368
  33. 412
  34. 176
  35. 520
  36. 52
  37. 392
  38. 496
  39. 436
  40. 288

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