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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 395 · 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. 1.60 × 8 =
  2. 2.43 × 4 =
  3. 3.30 × 4 =
  4. 4.101 × 4 =
  5. 5.63 × 8 =
  6. 6.96 × 4 =
  7. 7.72 × 8 =
  8. 8.21 × 4 =
  9. 9.160 × 4 =
  10. 10.51 × 8 =
  11. 11.20 × 8 =
  12. 12.73 × 8 =
  13. 13.35 × 8 =
  14. 14.73 × 8 =
  15. 15.14 × 8 =
  16. 16.112 × 4 =
  17. 17.45 × 8 =
  18. 18.40 × 8 =
  19. 19.76 × 4 =
  20. 20.28 × 8 =
  21. 21.67 × 8 =
  22. 22.82 × 4 =
  23. 23.18 × 8 =
  24. 24.101 × 4 =
  25. 25.59 × 8 =
  26. 26.59 × 4 =
  27. 27.31 × 8 =
  28. 28.57 × 4 =
  29. 29.39 × 8 =
  30. 30.79 × 4 =
  31. 31.107 × 4 =
  32. 32.36 × 8 =
  33. 33.142 × 4 =
  34. 34.58 × 4 =
  35. 35.121 × 4 =
  36. 36.14 × 8 =
  37. 37.20 × 8 =
  38. 38.104 × 4 =
  39. 39.59 × 8 =
  40. 40.51 × 4 =

Answer key

  1. 480
  2. 172
  3. 120
  4. 404
  5. 504
  6. 384
  7. 576
  8. 84
  9. 640
  10. 408
  11. 160
  12. 584
  13. 280
  14. 584
  15. 112
  16. 448
  17. 360
  18. 320
  19. 304
  20. 224
  21. 536
  22. 328
  23. 144
  24. 404
  25. 472
  26. 236
  27. 248
  28. 228
  29. 312
  30. 316
  31. 428
  32. 288
  33. 568
  34. 232
  35. 484
  36. 112
  37. 160
  38. 416
  39. 472
  40. 204

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