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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 428 · 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. 1.40 × 8 =
  2. 2.87 × 4 =
  3. 3.64 × 4 =
  4. 4.58 × 8 =
  5. 5.22 × 8 =
  6. 6.72 × 4 =
  7. 7.31 × 8 =
  8. 8.56 × 8 =
  9. 9.160 × 4 =
  10. 10.53 × 4 =
  11. 11.72 × 8 =
  12. 12.32 × 8 =
  13. 13.58 × 8 =
  14. 14.137 × 4 =
  15. 15.72 × 8 =
  16. 16.56 × 8 =
  17. 17.44 × 8 =
  18. 18.37 × 8 =
  19. 19.148 × 4 =
  20. 20.85 × 4 =
  21. 21.50 × 8 =
  22. 22.141 × 4 =
  23. 23.29 × 8 =
  24. 24.23 × 8 =
  25. 25.67 × 8 =
  26. 26.20 × 8 =
  27. 27.31 × 4 =
  28. 28.95 × 4 =
  29. 29.55 × 4 =
  30. 30.140 × 4 =
  31. 31.41 × 8 =
  32. 32.121 × 4 =
  33. 33.82 × 4 =
  34. 34.27 × 8 =
  35. 35.50 × 8 =
  36. 36.14 × 8 =
  37. 37.53 × 8 =
  38. 38.52 × 8 =
  39. 39.110 × 4 =
  40. 40.24 × 4 =

Answer key

  1. 320
  2. 348
  3. 256
  4. 464
  5. 176
  6. 288
  7. 248
  8. 448
  9. 640
  10. 212
  11. 576
  12. 256
  13. 464
  14. 548
  15. 576
  16. 448
  17. 352
  18. 296
  19. 592
  20. 340
  21. 400
  22. 564
  23. 232
  24. 184
  25. 536
  26. 160
  27. 124
  28. 380
  29. 220
  30. 560
  31. 328
  32. 484
  33. 328
  34. 216
  35. 400
  36. 112
  37. 424
  38. 416
  39. 440
  40. 96

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