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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 28 · 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. 1.45 × 8 =
  2. 2.67 × 4 =
  3. 3.114 × 4 =
  4. 4.71 × 8 =
  5. 5.28 × 8 =
  6. 6.67 × 8 =
  7. 7.52 × 8 =
  8. 8.13 × 8 =
  9. 9.80 × 4 =
  10. 10.20 × 4 =
  11. 11.15 × 8 =
  12. 12.28 × 8 =
  13. 13.49 × 8 =
  14. 14.59 × 4 =
  15. 15.130 × 4 =
  16. 16.19 × 8 =
  17. 17.38 × 8 =
  18. 18.72 × 4 =
  19. 19.65 × 8 =
  20. 20.146 × 4 =
  21. 21.41 × 4 =
  22. 22.63 × 8 =
  23. 23.113 × 4 =
  24. 24.36 × 8 =
  25. 25.99 × 4 =
  26. 26.150 × 4 =
  27. 27.106 × 4 =
  28. 28.37 × 8 =
  29. 29.37 × 8 =
  30. 30.68 × 8 =
  31. 31.44 × 8 =
  32. 32.76 × 4 =
  33. 33.147 × 4 =
  34. 34.43 × 8 =
  35. 35.40 × 4 =
  36. 36.115 × 4 =
  37. 37.43 × 4 =
  38. 38.155 × 4 =
  39. 39.35 × 8 =
  40. 40.70 × 4 =

Answer key

  1. 360
  2. 268
  3. 456
  4. 568
  5. 224
  6. 536
  7. 416
  8. 104
  9. 320
  10. 80
  11. 120
  12. 224
  13. 392
  14. 236
  15. 520
  16. 152
  17. 304
  18. 288
  19. 520
  20. 584
  21. 164
  22. 504
  23. 452
  24. 288
  25. 396
  26. 600
  27. 424
  28. 296
  29. 296
  30. 544
  31. 352
  32. 304
  33. 588
  34. 344
  35. 160
  36. 460
  37. 172
  38. 620
  39. 280
  40. 280

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