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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 302 · 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. 1.73 × 8 =
  2. 2.122 × 4 =
  3. 3.107 × 4 =
  4. 4.14 × 8 =
  5. 5.80 × 4 =
  6. 6.114 × 4 =
  7. 7.152 × 4 =
  8. 8.99 × 4 =
  9. 9.35 × 4 =
  10. 10.18 × 8 =
  11. 11.41 × 8 =
  12. 12.63 × 4 =
  13. 13.49 × 8 =
  14. 14.77 × 4 =
  15. 15.44 × 8 =
  16. 16.70 × 4 =
  17. 17.28 × 8 =
  18. 18.39 × 8 =
  19. 19.24 × 4 =
  20. 20.59 × 8 =
  21. 21.129 × 4 =
  22. 22.120 × 4 =
  23. 23.69 × 4 =
  24. 24.38 × 8 =
  25. 25.50 × 8 =
  26. 26.69 × 8 =
  27. 27.22 × 8 =
  28. 28.92 × 4 =
  29. 29.129 × 4 =
  30. 30.63 × 4 =
  31. 31.78 × 4 =
  32. 32.19 × 4 =
  33. 33.52 × 4 =
  34. 34.32 × 8 =
  35. 35.44 × 8 =
  36. 36.108 × 4 =
  37. 37.140 × 4 =
  38. 38.36 × 8 =
  39. 39.46 × 8 =
  40. 40.48 × 4 =

Answer key

  1. 584
  2. 488
  3. 428
  4. 112
  5. 320
  6. 456
  7. 608
  8. 396
  9. 140
  10. 144
  11. 328
  12. 252
  13. 392
  14. 308
  15. 352
  16. 280
  17. 224
  18. 312
  19. 96
  20. 472
  21. 516
  22. 480
  23. 276
  24. 304
  25. 400
  26. 552
  27. 176
  28. 368
  29. 516
  30. 252
  31. 312
  32. 76
  33. 208
  34. 256
  35. 352
  36. 432
  37. 560
  38. 288
  39. 368
  40. 192

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