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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 369 · 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. 1.28 × 4 =
  2. 2.14 × 4 =
  3. 3.60 × 8 =
  4. 4.120 × 4 =
  5. 5.25 × 4 =
  6. 6.66 × 4 =
  7. 7.43 × 8 =
  8. 8.91 × 4 =
  9. 9.78 × 4 =
  10. 10.61 × 8 =
  11. 11.60 × 8 =
  12. 12.51 × 8 =
  13. 13.73 × 8 =
  14. 14.99 × 4 =
  15. 15.60 × 8 =
  16. 16.45 × 8 =
  17. 17.36 × 8 =
  18. 18.48 × 4 =
  19. 19.30 × 8 =
  20. 20.124 × 4 =
  21. 21.46 × 4 =
  22. 22.147 × 4 =
  23. 23.67 × 8 =
  24. 24.45 × 4 =
  25. 25.123 × 4 =
  26. 26.141 × 4 =
  27. 27.43 × 4 =
  28. 28.12 × 8 =
  29. 29.93 × 4 =
  30. 30.155 × 4 =
  31. 31.144 × 4 =
  32. 32.45 × 8 =
  33. 33.112 × 4 =
  34. 34.27 × 8 =
  35. 35.34 × 8 =
  36. 36.60 × 4 =
  37. 37.28 × 8 =
  38. 38.53 × 8 =
  39. 39.36 × 8 =
  40. 40.27 × 4 =

Answer key

  1. 112
  2. 56
  3. 480
  4. 480
  5. 100
  6. 264
  7. 344
  8. 364
  9. 312
  10. 488
  11. 480
  12. 408
  13. 584
  14. 396
  15. 480
  16. 360
  17. 288
  18. 192
  19. 240
  20. 496
  21. 184
  22. 588
  23. 536
  24. 180
  25. 492
  26. 564
  27. 172
  28. 96
  29. 372
  30. 620
  31. 576
  32. 360
  33. 448
  34. 216
  35. 272
  36. 240
  37. 224
  38. 424
  39. 288
  40. 108

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