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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 49 · 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. 1.62 × 4 =
  2. 2.16 × 4 =
  3. 3.73 × 4 =
  4. 4.77 × 4 =
  5. 5.102 × 4 =
  6. 6.97 × 4 =
  7. 7.74 × 8 =
  8. 8.75 × 4 =
  9. 9.51 × 8 =
  10. 10.15 × 8 =
  11. 11.73 × 8 =
  12. 12.141 × 4 =
  13. 13.139 × 4 =
  14. 14.28 × 8 =
  15. 15.37 × 4 =
  16. 16.37 × 8 =
  17. 17.19 × 8 =
  18. 18.58 × 8 =
  19. 19.144 × 4 =
  20. 20.32 × 8 =
  21. 21.79 × 4 =
  22. 22.70 × 8 =
  23. 23.15 × 4 =
  24. 24.91 × 4 =
  25. 25.68 × 8 =
  26. 26.15 × 4 =
  27. 27.21 × 8 =
  28. 28.110 × 4 =
  29. 29.157 × 4 =
  30. 30.23 × 8 =
  31. 31.37 × 4 =
  32. 32.23 × 8 =
  33. 33.24 × 8 =
  34. 34.62 × 8 =
  35. 35.21 × 4 =
  36. 36.22 × 8 =
  37. 37.38 × 4 =
  38. 38.31 × 8 =
  39. 39.43 × 4 =
  40. 40.93 × 4 =

Answer key

  1. 248
  2. 64
  3. 292
  4. 308
  5. 408
  6. 388
  7. 592
  8. 300
  9. 408
  10. 120
  11. 584
  12. 564
  13. 556
  14. 224
  15. 148
  16. 296
  17. 152
  18. 464
  19. 576
  20. 256
  21. 316
  22. 560
  23. 60
  24. 364
  25. 544
  26. 60
  27. 168
  28. 440
  29. 628
  30. 184
  31. 148
  32. 184
  33. 192
  34. 496
  35. 84
  36. 176
  37. 152
  38. 248
  39. 172
  40. 372

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