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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 303 · 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. 1.49 × 8 =
  2. 2.115 × 4 =
  3. 3.143 × 4 =
  4. 4.124 × 4 =
  5. 5.64 × 8 =
  6. 6.52 × 8 =
  7. 7.58 × 4 =
  8. 8.136 × 4 =
  9. 9.109 × 4 =
  10. 10.157 × 4 =
  11. 11.42 × 8 =
  12. 12.43 × 8 =
  13. 13.40 × 8 =
  14. 14.19 × 8 =
  15. 15.21 × 8 =
  16. 16.19 × 8 =
  17. 17.78 × 4 =
  18. 18.35 × 8 =
  19. 19.45 × 8 =
  20. 20.78 × 4 =
  21. 21.70 × 4 =
  22. 22.69 × 8 =
  23. 23.65 × 8 =
  24. 24.58 × 4 =
  25. 25.27 × 8 =
  26. 26.120 × 4 =
  27. 27.73 × 8 =
  28. 28.50 × 8 =
  29. 29.67 × 4 =
  30. 30.24 × 8 =
  31. 31.15 × 8 =
  32. 32.139 × 4 =
  33. 33.80 × 4 =
  34. 34.71 × 8 =
  35. 35.112 × 4 =
  36. 36.13 × 8 =
  37. 37.50 × 4 =
  38. 38.45 × 8 =
  39. 39.19 × 4 =
  40. 40.106 × 4 =

Answer key

  1. 392
  2. 460
  3. 572
  4. 496
  5. 512
  6. 416
  7. 232
  8. 544
  9. 436
  10. 628
  11. 336
  12. 344
  13. 320
  14. 152
  15. 168
  16. 152
  17. 312
  18. 280
  19. 360
  20. 312
  21. 280
  22. 552
  23. 520
  24. 232
  25. 216
  26. 480
  27. 584
  28. 400
  29. 268
  30. 192
  31. 120
  32. 556
  33. 320
  34. 568
  35. 448
  36. 104
  37. 200
  38. 360
  39. 76
  40. 424

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