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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 329 · 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. 1.155 × 4 =
  2. 2.34 × 4 =
  3. 3.29 × 8 =
  4. 4.16 × 8 =
  5. 5.58 × 8 =
  6. 6.34 × 8 =
  7. 7.62 × 4 =
  8. 8.88 × 4 =
  9. 9.23 × 8 =
  10. 10.20 × 8 =
  11. 11.79 × 4 =
  12. 12.30 × 4 =
  13. 13.36 × 8 =
  14. 14.128 × 4 =
  15. 15.38 × 4 =
  16. 16.22 × 8 =
  17. 17.60 × 4 =
  18. 18.54 × 8 =
  19. 19.70 × 8 =
  20. 20.141 × 4 =
  21. 21.36 × 8 =
  22. 22.120 × 4 =
  23. 23.100 × 4 =
  24. 24.37 × 8 =
  25. 25.13 × 4 =
  26. 26.45 × 4 =
  27. 27.58 × 8 =
  28. 28.70 × 8 =
  29. 29.50 × 8 =
  30. 30.53 × 4 =
  31. 31.96 × 4 =
  32. 32.26 × 8 =
  33. 33.149 × 4 =
  34. 34.54 × 4 =
  35. 35.34 × 8 =
  36. 36.72 × 4 =
  37. 37.41 × 8 =
  38. 38.53 × 4 =
  39. 39.25 × 4 =
  40. 40.17 × 8 =

Answer key

  1. 620
  2. 136
  3. 232
  4. 128
  5. 464
  6. 272
  7. 248
  8. 352
  9. 184
  10. 160
  11. 316
  12. 120
  13. 288
  14. 512
  15. 152
  16. 176
  17. 240
  18. 432
  19. 560
  20. 564
  21. 288
  22. 480
  23. 400
  24. 296
  25. 52
  26. 180
  27. 464
  28. 560
  29. 400
  30. 212
  31. 384
  32. 208
  33. 596
  34. 216
  35. 272
  36. 288
  37. 328
  38. 212
  39. 100
  40. 136

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