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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 168 · 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. 1.71 × 8 =
  2. 2.91 × 4 =
  3. 3.78 × 4 =
  4. 4.73 × 8 =
  5. 5.55 × 4 =
  6. 6.71 × 8 =
  7. 7.60 × 8 =
  8. 8.21 × 8 =
  9. 9.40 × 8 =
  10. 10.86 × 4 =
  11. 11.46 × 4 =
  12. 12.62 × 8 =
  13. 13.125 × 4 =
  14. 14.40 × 8 =
  15. 15.30 × 8 =
  16. 16.66 × 8 =
  17. 17.64 × 4 =
  18. 18.31 × 4 =
  19. 19.71 × 4 =
  20. 20.51 × 4 =
  21. 21.65 × 4 =
  22. 22.55 × 4 =
  23. 23.54 × 8 =
  24. 24.153 × 4 =
  25. 25.51 × 4 =
  26. 26.36 × 8 =
  27. 27.104 × 4 =
  28. 28.72 × 8 =
  29. 29.54 × 8 =
  30. 30.64 × 4 =
  31. 31.40 × 8 =
  32. 32.59 × 8 =
  33. 33.118 × 4 =
  34. 34.13 × 8 =
  35. 35.139 × 4 =
  36. 36.26 × 8 =
  37. 37.33 × 8 =
  38. 38.14 × 4 =
  39. 39.48 × 8 =
  40. 40.20 × 8 =

Answer key

  1. 568
  2. 364
  3. 312
  4. 584
  5. 220
  6. 568
  7. 480
  8. 168
  9. 320
  10. 344
  11. 184
  12. 496
  13. 500
  14. 320
  15. 240
  16. 528
  17. 256
  18. 124
  19. 284
  20. 204
  21. 260
  22. 220
  23. 432
  24. 612
  25. 204
  26. 288
  27. 416
  28. 576
  29. 432
  30. 256
  31. 320
  32. 472
  33. 472
  34. 104
  35. 556
  36. 208
  37. 264
  38. 56
  39. 384
  40. 160

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