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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 631 · 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. 1.151 × 4 =
  2. 2.25 × 4 =
  3. 3.20 × 4 =
  4. 4.49 × 8 =
  5. 5.44 × 8 =
  6. 6.138 × 4 =
  7. 7.125 × 4 =
  8. 8.49 × 8 =
  9. 9.154 × 4 =
  10. 10.19 × 4 =
  11. 11.127 × 4 =
  12. 12.150 × 4 =
  13. 13.38 × 8 =
  14. 14.106 × 4 =
  15. 15.19 × 8 =
  16. 16.20 × 4 =
  17. 17.28 × 4 =
  18. 18.93 × 4 =
  19. 19.71 × 8 =
  20. 20.152 × 4 =
  21. 21.102 × 4 =
  22. 22.135 × 4 =
  23. 23.15 × 8 =
  24. 24.53 × 8 =
  25. 25.70 × 8 =
  26. 26.91 × 4 =
  27. 27.98 × 4 =
  28. 28.88 × 4 =
  29. 29.118 × 4 =
  30. 30.126 × 4 =
  31. 31.65 × 8 =
  32. 32.37 × 8 =
  33. 33.19 × 8 =
  34. 34.47 × 4 =
  35. 35.127 × 4 =
  36. 36.70 × 8 =
  37. 37.27 × 8 =
  38. 38.154 × 4 =
  39. 39.25 × 8 =
  40. 40.123 × 4 =

Answer key

  1. 604
  2. 100
  3. 80
  4. 392
  5. 352
  6. 552
  7. 500
  8. 392
  9. 616
  10. 76
  11. 508
  12. 600
  13. 304
  14. 424
  15. 152
  16. 80
  17. 112
  18. 372
  19. 568
  20. 608
  21. 408
  22. 540
  23. 120
  24. 424
  25. 560
  26. 364
  27. 392
  28. 352
  29. 472
  30. 504
  31. 520
  32. 296
  33. 152
  34. 188
  35. 508
  36. 560
  37. 216
  38. 616
  39. 200
  40. 492

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