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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 215 · 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. 1.55 × 8 =
  2. 2.14 × 8 =
  3. 3.39 × 4 =
  4. 4.78 × 4 =
  5. 5.145 × 4 =
  6. 6.127 × 4 =
  7. 7.70 × 8 =
  8. 8.75 × 8 =
  9. 9.43 × 8 =
  10. 10.104 × 4 =
  11. 11.72 × 4 =
  12. 12.53 × 8 =
  13. 13.23 × 4 =
  14. 14.61 × 4 =
  15. 15.71 × 8 =
  16. 16.68 × 4 =
  17. 17.92 × 4 =
  18. 18.13 × 4 =
  19. 19.46 × 8 =
  20. 20.61 × 8 =
  21. 21.52 × 8 =
  22. 22.34 × 8 =
  23. 23.71 × 8 =
  24. 24.149 × 4 =
  25. 25.36 × 8 =
  26. 26.26 × 4 =
  27. 27.43 × 8 =
  28. 28.17 × 4 =
  29. 29.28 × 4 =
  30. 30.40 × 8 =
  31. 31.46 × 8 =
  32. 32.21 × 4 =
  33. 33.72 × 8 =
  34. 34.16 × 8 =
  35. 35.22 × 8 =
  36. 36.20 × 8 =
  37. 37.46 × 4 =
  38. 38.49 × 8 =
  39. 39.67 × 4 =
  40. 40.54 × 4 =

Answer key

  1. 440
  2. 112
  3. 156
  4. 312
  5. 580
  6. 508
  7. 560
  8. 600
  9. 344
  10. 416
  11. 288
  12. 424
  13. 92
  14. 244
  15. 568
  16. 272
  17. 368
  18. 52
  19. 368
  20. 488
  21. 416
  22. 272
  23. 568
  24. 596
  25. 288
  26. 104
  27. 344
  28. 68
  29. 112
  30. 320
  31. 368
  32. 84
  33. 576
  34. 128
  35. 176
  36. 160
  37. 184
  38. 392
  39. 268
  40. 216

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