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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 315 · 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. 1.80 × 4 =
  2. 2.105 × 4 =
  3. 3.28 × 8 =
  4. 4.159 × 4 =
  5. 5.61 × 4 =
  6. 6.111 × 4 =
  7. 7.79 × 4 =
  8. 8.33 × 8 =
  9. 9.87 × 4 =
  10. 10.67 × 4 =
  11. 11.89 × 4 =
  12. 12.58 × 4 =
  13. 13.22 × 4 =
  14. 14.59 × 4 =
  15. 15.13 × 8 =
  16. 16.159 × 4 =
  17. 17.21 × 8 =
  18. 18.73 × 8 =
  19. 19.27 × 8 =
  20. 20.100 × 4 =
  21. 21.48 × 8 =
  22. 22.149 × 4 =
  23. 23.30 × 8 =
  24. 24.44 × 8 =
  25. 25.60 × 8 =
  26. 26.125 × 4 =
  27. 27.27 × 4 =
  28. 28.104 × 4 =
  29. 29.72 × 4 =
  30. 30.16 × 8 =
  31. 31.40 × 8 =
  32. 32.47 × 4 =
  33. 33.43 × 8 =
  34. 34.145 × 4 =
  35. 35.68 × 8 =
  36. 36.41 × 8 =
  37. 37.79 × 4 =
  38. 38.93 × 4 =
  39. 39.47 × 4 =
  40. 40.34 × 8 =

Answer key

  1. 320
  2. 420
  3. 224
  4. 636
  5. 244
  6. 444
  7. 316
  8. 264
  9. 348
  10. 268
  11. 356
  12. 232
  13. 88
  14. 236
  15. 104
  16. 636
  17. 168
  18. 584
  19. 216
  20. 400
  21. 384
  22. 596
  23. 240
  24. 352
  25. 480
  26. 500
  27. 108
  28. 416
  29. 288
  30. 128
  31. 320
  32. 188
  33. 344
  34. 580
  35. 544
  36. 328
  37. 316
  38. 372
  39. 188
  40. 272

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