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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 151 · 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. 1.50 × 8 =
  2. 2.24 × 4 =
  3. 3.151 × 4 =
  4. 4.45 × 4 =
  5. 5.73 × 4 =
  6. 6.28 × 8 =
  7. 7.108 × 4 =
  8. 8.103 × 4 =
  9. 9.74 × 4 =
  10. 10.73 × 8 =
  11. 11.33 × 8 =
  12. 12.134 × 4 =
  13. 13.32 × 8 =
  14. 14.87 × 4 =
  15. 15.35 × 4 =
  16. 16.51 × 8 =
  17. 17.73 × 4 =
  18. 18.129 × 4 =
  19. 19.56 × 8 =
  20. 20.50 × 8 =
  21. 21.64 × 8 =
  22. 22.127 × 4 =
  23. 23.85 × 4 =
  24. 24.41 × 4 =
  25. 25.52 × 4 =
  26. 26.30 × 8 =
  27. 27.36 × 8 =
  28. 28.34 × 8 =
  29. 29.88 × 4 =
  30. 30.106 × 4 =
  31. 31.81 × 4 =
  32. 32.41 × 4 =
  33. 33.159 × 4 =
  34. 34.35 × 8 =
  35. 35.29 × 4 =
  36. 36.65 × 4 =
  37. 37.18 × 4 =
  38. 38.87 × 4 =
  39. 39.156 × 4 =
  40. 40.68 × 8 =

Answer key

  1. 400
  2. 96
  3. 604
  4. 180
  5. 292
  6. 224
  7. 432
  8. 412
  9. 296
  10. 584
  11. 264
  12. 536
  13. 256
  14. 348
  15. 140
  16. 408
  17. 292
  18. 516
  19. 448
  20. 400
  21. 512
  22. 508
  23. 340
  24. 164
  25. 208
  26. 240
  27. 288
  28. 272
  29. 352
  30. 424
  31. 324
  32. 164
  33. 636
  34. 280
  35. 116
  36. 260
  37. 72
  38. 348
  39. 624
  40. 544

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