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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 670 · 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. 1.108 × 4 =
  2. 2.114 × 4 =
  3. 3.36 × 4 =
  4. 4.51 × 8 =
  5. 5.75 × 8 =
  6. 6.158 × 4 =
  7. 7.152 × 4 =
  8. 8.43 × 4 =
  9. 9.60 × 8 =
  10. 10.122 × 4 =
  11. 11.25 × 8 =
  12. 12.34 × 8 =
  13. 13.41 × 4 =
  14. 14.154 × 4 =
  15. 15.14 × 8 =
  16. 16.53 × 4 =
  17. 17.22 × 8 =
  18. 18.88 × 4 =
  19. 19.88 × 4 =
  20. 20.41 × 8 =
  21. 21.105 × 4 =
  22. 22.73 × 8 =
  23. 23.27 × 8 =
  24. 24.97 × 4 =
  25. 25.75 × 8 =
  26. 26.28 × 8 =
  27. 27.40 × 8 =
  28. 28.70 × 8 =
  29. 29.24 × 8 =
  30. 30.84 × 4 =
  31. 31.75 × 8 =
  32. 32.22 × 4 =
  33. 33.21 × 8 =
  34. 34.89 × 4 =
  35. 35.53 × 4 =
  36. 36.22 × 8 =
  37. 37.33 × 8 =
  38. 38.111 × 4 =
  39. 39.68 × 4 =
  40. 40.54 × 8 =

Answer key

  1. 432
  2. 456
  3. 144
  4. 408
  5. 600
  6. 632
  7. 608
  8. 172
  9. 480
  10. 488
  11. 200
  12. 272
  13. 164
  14. 616
  15. 112
  16. 212
  17. 176
  18. 352
  19. 352
  20. 328
  21. 420
  22. 584
  23. 216
  24. 388
  25. 600
  26. 224
  27. 320
  28. 560
  29. 192
  30. 336
  31. 600
  32. 88
  33. 168
  34. 356
  35. 212
  36. 176
  37. 264
  38. 444
  39. 272
  40. 432

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