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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 370 · 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. 1.144 × 4 =
  2. 2.80 × 4 =
  3. 3.36 × 8 =
  4. 4.74 × 4 =
  5. 5.98 × 4 =
  6. 6.17 × 4 =
  7. 7.19 × 4 =
  8. 8.29 × 4 =
  9. 9.139 × 4 =
  10. 10.34 × 8 =
  11. 11.26 × 8 =
  12. 12.49 × 8 =
  13. 13.102 × 4 =
  14. 14.18 × 4 =
  15. 15.60 × 4 =
  16. 16.68 × 8 =
  17. 17.50 × 4 =
  18. 18.16 × 8 =
  19. 19.160 × 4 =
  20. 20.13 × 4 =
  21. 21.137 × 4 =
  22. 22.139 × 4 =
  23. 23.42 × 8 =
  24. 24.103 × 4 =
  25. 25.49 × 8 =
  26. 26.28 × 4 =
  27. 27.146 × 4 =
  28. 28.60 × 4 =
  29. 29.48 × 8 =
  30. 30.103 × 4 =
  31. 31.72 × 4 =
  32. 32.34 × 4 =
  33. 33.16 × 8 =
  34. 34.56 × 8 =
  35. 35.58 × 4 =
  36. 36.42 × 4 =
  37. 37.13 × 8 =
  38. 38.17 × 8 =
  39. 39.73 × 8 =
  40. 40.89 × 4 =

Answer key

  1. 576
  2. 320
  3. 288
  4. 296
  5. 392
  6. 68
  7. 76
  8. 116
  9. 556
  10. 272
  11. 208
  12. 392
  13. 408
  14. 72
  15. 240
  16. 544
  17. 200
  18. 128
  19. 640
  20. 52
  21. 548
  22. 556
  23. 336
  24. 412
  25. 392
  26. 112
  27. 584
  28. 240
  29. 384
  30. 412
  31. 288
  32. 136
  33. 128
  34. 448
  35. 232
  36. 168
  37. 104
  38. 136
  39. 584
  40. 356

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