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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 648 · 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. 1.39 × 8 =
  2. 2.13 × 4 =
  3. 3.116 × 4 =
  4. 4.106 × 4 =
  5. 5.55 × 8 =
  6. 6.36 × 8 =
  7. 7.128 × 4 =
  8. 8.135 × 4 =
  9. 9.114 × 4 =
  10. 10.73 × 8 =
  11. 11.107 × 4 =
  12. 12.74 × 8 =
  13. 13.74 × 8 =
  14. 14.38 × 8 =
  15. 15.26 × 8 =
  16. 16.16 × 8 =
  17. 17.135 × 4 =
  18. 18.106 × 4 =
  19. 19.41 × 4 =
  20. 20.154 × 4 =
  21. 21.81 × 4 =
  22. 22.132 × 4 =
  23. 23.53 × 4 =
  24. 24.107 × 4 =
  25. 25.23 × 8 =
  26. 26.137 × 4 =
  27. 27.109 × 4 =
  28. 28.139 × 4 =
  29. 29.70 × 8 =
  30. 30.16 × 8 =
  31. 31.127 × 4 =
  32. 32.44 × 4 =
  33. 33.75 × 4 =
  34. 34.52 × 4 =
  35. 35.101 × 4 =
  36. 36.55 × 8 =
  37. 37.30 × 8 =
  38. 38.32 × 4 =
  39. 39.139 × 4 =
  40. 40.57 × 8 =

Answer key

  1. 312
  2. 52
  3. 464
  4. 424
  5. 440
  6. 288
  7. 512
  8. 540
  9. 456
  10. 584
  11. 428
  12. 592
  13. 592
  14. 304
  15. 208
  16. 128
  17. 540
  18. 424
  19. 164
  20. 616
  21. 324
  22. 528
  23. 212
  24. 428
  25. 184
  26. 548
  27. 436
  28. 556
  29. 560
  30. 128
  31. 508
  32. 176
  33. 300
  34. 208
  35. 404
  36. 440
  37. 240
  38. 128
  39. 556
  40. 456

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