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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 38 · 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. 1.32 × 4 =
  2. 2.19 × 4 =
  3. 3.18 × 8 =
  4. 4.60 × 4 =
  5. 5.56 × 8 =
  6. 6.44 × 4 =
  7. 7.91 × 4 =
  8. 8.22 × 8 =
  9. 9.29 × 8 =
  10. 10.13 × 8 =
  11. 11.16 × 4 =
  12. 12.145 × 4 =
  13. 13.29 × 8 =
  14. 14.80 × 4 =
  15. 15.63 × 4 =
  16. 16.28 × 8 =
  17. 17.74 × 8 =
  18. 18.78 × 4 =
  19. 19.51 × 8 =
  20. 20.107 × 4 =
  21. 21.40 × 8 =
  22. 22.33 × 8 =
  23. 23.34 × 8 =
  24. 24.37 × 8 =
  25. 25.50 × 8 =
  26. 26.29 × 8 =
  27. 27.146 × 4 =
  28. 28.35 × 4 =
  29. 29.17 × 8 =
  30. 30.31 × 8 =
  31. 31.29 × 8 =
  32. 32.55 × 8 =
  33. 33.51 × 4 =
  34. 34.132 × 4 =
  35. 35.47 × 8 =
  36. 36.63 × 4 =
  37. 37.74 × 8 =
  38. 38.75 × 4 =
  39. 39.41 × 8 =
  40. 40.109 × 4 =

Answer key

  1. 128
  2. 76
  3. 144
  4. 240
  5. 448
  6. 176
  7. 364
  8. 176
  9. 232
  10. 104
  11. 64
  12. 580
  13. 232
  14. 320
  15. 252
  16. 224
  17. 592
  18. 312
  19. 408
  20. 428
  21. 320
  22. 264
  23. 272
  24. 296
  25. 400
  26. 232
  27. 584
  28. 140
  29. 136
  30. 248
  31. 232
  32. 440
  33. 204
  34. 528
  35. 376
  36. 252
  37. 592
  38. 300
  39. 328
  40. 436

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