← Doubling sprints: × 4 and × 8 lesson New set →

Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 408 · 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. 1.128 × 4 =
  2. 2.36 × 8 =
  3. 3.149 × 4 =
  4. 4.43 × 8 =
  5. 5.36 × 4 =
  6. 6.53 × 4 =
  7. 7.122 × 4 =
  8. 8.35 × 8 =
  9. 9.117 × 4 =
  10. 10.74 × 8 =
  11. 11.35 × 4 =
  12. 12.105 × 4 =
  13. 13.43 × 8 =
  14. 14.22 × 8 =
  15. 15.93 × 4 =
  16. 16.12 × 8 =
  17. 17.36 × 8 =
  18. 18.126 × 4 =
  19. 19.34 × 8 =
  20. 20.22 × 8 =
  21. 21.43 × 8 =
  22. 22.35 × 8 =
  23. 23.155 × 4 =
  24. 24.141 × 4 =
  25. 25.38 × 4 =
  26. 26.51 × 4 =
  27. 27.69 × 8 =
  28. 28.43 × 8 =
  29. 29.87 × 4 =
  30. 30.57 × 4 =
  31. 31.147 × 4 =
  32. 32.20 × 8 =
  33. 33.142 × 4 =
  34. 34.97 × 4 =
  35. 35.25 × 8 =
  36. 36.16 × 8 =
  37. 37.32 × 8 =
  38. 38.115 × 4 =
  39. 39.69 × 8 =
  40. 40.65 × 8 =

Answer key

  1. 512
  2. 288
  3. 596
  4. 344
  5. 144
  6. 212
  7. 488
  8. 280
  9. 468
  10. 592
  11. 140
  12. 420
  13. 344
  14. 176
  15. 372
  16. 96
  17. 288
  18. 504
  19. 272
  20. 176
  21. 344
  22. 280
  23. 620
  24. 564
  25. 152
  26. 204
  27. 552
  28. 344
  29. 348
  30. 228
  31. 588
  32. 160
  33. 568
  34. 388
  35. 200
  36. 128
  37. 256
  38. 460
  39. 552
  40. 520

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths