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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 140 · 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. 1.86 × 4 =
  2. 2.134 × 4 =
  3. 3.48 × 8 =
  4. 4.150 × 4 =
  5. 5.23 × 8 =
  6. 6.69 × 8 =
  7. 7.32 × 8 =
  8. 8.155 × 4 =
  9. 9.124 × 4 =
  10. 10.51 × 8 =
  11. 11.94 × 4 =
  12. 12.15 × 4 =
  13. 13.130 × 4 =
  14. 14.42 × 4 =
  15. 15.43 × 4 =
  16. 16.117 × 4 =
  17. 17.67 × 8 =
  18. 18.38 × 4 =
  19. 19.58 × 4 =
  20. 20.48 × 8 =
  21. 21.94 × 4 =
  22. 22.135 × 4 =
  23. 23.44 × 4 =
  24. 24.12 × 8 =
  25. 25.34 × 4 =
  26. 26.49 × 8 =
  27. 27.69 × 8 =
  28. 28.18 × 8 =
  29. 29.106 × 4 =
  30. 30.23 × 8 =
  31. 31.43 × 8 =
  32. 32.46 × 4 =
  33. 33.96 × 4 =
  34. 34.122 × 4 =
  35. 35.119 × 4 =
  36. 36.70 × 8 =
  37. 37.143 × 4 =
  38. 38.136 × 4 =
  39. 39.101 × 4 =
  40. 40.105 × 4 =

Answer key

  1. 344
  2. 536
  3. 384
  4. 600
  5. 184
  6. 552
  7. 256
  8. 620
  9. 496
  10. 408
  11. 376
  12. 60
  13. 520
  14. 168
  15. 172
  16. 468
  17. 536
  18. 152
  19. 232
  20. 384
  21. 376
  22. 540
  23. 176
  24. 96
  25. 136
  26. 392
  27. 552
  28. 144
  29. 424
  30. 184
  31. 344
  32. 184
  33. 384
  34. 488
  35. 476
  36. 560
  37. 572
  38. 544
  39. 404
  40. 420

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