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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 628 · 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. 1.106 × 4 =
  2. 2.28 × 4 =
  3. 3.87 × 4 =
  4. 4.35 × 4 =
  5. 5.111 × 4 =
  6. 6.23 × 8 =
  7. 7.26 × 8 =
  8. 8.142 × 4 =
  9. 9.98 × 4 =
  10. 10.83 × 4 =
  11. 11.24 × 8 =
  12. 12.25 × 4 =
  13. 13.65 × 8 =
  14. 14.48 × 8 =
  15. 15.22 × 8 =
  16. 16.94 × 4 =
  17. 17.38 × 8 =
  18. 18.52 × 8 =
  19. 19.21 × 4 =
  20. 20.38 × 8 =
  21. 21.39 × 8 =
  22. 22.27 × 4 =
  23. 23.42 × 4 =
  24. 24.60 × 8 =
  25. 25.76 × 4 =
  26. 26.47 × 8 =
  27. 27.48 × 8 =
  28. 28.59 × 8 =
  29. 29.69 × 8 =
  30. 30.38 × 4 =
  31. 31.14 × 8 =
  32. 32.44 × 4 =
  33. 33.88 × 4 =
  34. 34.153 × 4 =
  35. 35.110 × 4 =
  36. 36.47 × 8 =
  37. 37.15 × 8 =
  38. 38.35 × 8 =
  39. 39.132 × 4 =
  40. 40.75 × 8 =

Answer key

  1. 424
  2. 112
  3. 348
  4. 140
  5. 444
  6. 184
  7. 208
  8. 568
  9. 392
  10. 332
  11. 192
  12. 100
  13. 520
  14. 384
  15. 176
  16. 376
  17. 304
  18. 416
  19. 84
  20. 304
  21. 312
  22. 108
  23. 168
  24. 480
  25. 304
  26. 376
  27. 384
  28. 472
  29. 552
  30. 152
  31. 112
  32. 176
  33. 352
  34. 612
  35. 440
  36. 376
  37. 120
  38. 280
  39. 528
  40. 600

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