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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 230 · 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. 1.23 × 8 =
  2. 2.41 × 8 =
  3. 3.125 × 4 =
  4. 4.38 × 4 =
  5. 5.71 × 8 =
  6. 6.31 × 8 =
  7. 7.68 × 8 =
  8. 8.32 × 8 =
  9. 9.46 × 4 =
  10. 10.48 × 4 =
  11. 11.21 × 8 =
  12. 12.52 × 4 =
  13. 13.27 × 4 =
  14. 14.57 × 8 =
  15. 15.15 × 4 =
  16. 16.159 × 4 =
  17. 17.68 × 4 =
  18. 18.49 × 4 =
  19. 19.32 × 8 =
  20. 20.28 × 8 =
  21. 21.35 × 8 =
  22. 22.29 × 8 =
  23. 23.58 × 4 =
  24. 24.29 × 8 =
  25. 25.44 × 8 =
  26. 26.22 × 4 =
  27. 27.38 × 8 =
  28. 28.16 × 8 =
  29. 29.20 × 8 =
  30. 30.37 × 4 =
  31. 31.109 × 4 =
  32. 32.52 × 8 =
  33. 33.73 × 8 =
  34. 34.81 × 4 =
  35. 35.21 × 8 =
  36. 36.49 × 4 =
  37. 37.94 × 4 =
  38. 38.77 × 4 =
  39. 39.34 × 4 =
  40. 40.17 × 8 =

Answer key

  1. 184
  2. 328
  3. 500
  4. 152
  5. 568
  6. 248
  7. 544
  8. 256
  9. 184
  10. 192
  11. 168
  12. 208
  13. 108
  14. 456
  15. 60
  16. 636
  17. 272
  18. 196
  19. 256
  20. 224
  21. 280
  22. 232
  23. 232
  24. 232
  25. 352
  26. 88
  27. 304
  28. 128
  29. 160
  30. 148
  31. 436
  32. 416
  33. 584
  34. 324
  35. 168
  36. 196
  37. 376
  38. 308
  39. 136
  40. 136

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