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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 405 · 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. 1.57 × 8 =
  2. 2.110 × 4 =
  3. 3.28 × 4 =
  4. 4.135 × 4 =
  5. 5.96 × 4 =
  6. 6.70 × 4 =
  7. 7.29 × 8 =
  8. 8.137 × 4 =
  9. 9.62 × 8 =
  10. 10.26 × 8 =
  11. 11.112 × 4 =
  12. 12.72 × 8 =
  13. 13.148 × 4 =
  14. 14.72 × 4 =
  15. 15.57 × 4 =
  16. 16.27 × 8 =
  17. 17.62 × 8 =
  18. 18.85 × 4 =
  19. 19.75 × 8 =
  20. 20.147 × 4 =
  21. 21.49 × 8 =
  22. 22.62 × 4 =
  23. 23.131 × 4 =
  24. 24.73 × 8 =
  25. 25.14 × 4 =
  26. 26.57 × 8 =
  27. 27.58 × 8 =
  28. 28.22 × 4 =
  29. 29.59 × 8 =
  30. 30.59 × 8 =
  31. 31.123 × 4 =
  32. 32.156 × 4 =
  33. 33.118 × 4 =
  34. 34.44 × 4 =
  35. 35.32 × 8 =
  36. 36.25 × 4 =
  37. 37.18 × 4 =
  38. 38.52 × 8 =
  39. 39.57 × 8 =
  40. 40.68 × 8 =

Answer key

  1. 456
  2. 440
  3. 112
  4. 540
  5. 384
  6. 280
  7. 232
  8. 548
  9. 496
  10. 208
  11. 448
  12. 576
  13. 592
  14. 288
  15. 228
  16. 216
  17. 496
  18. 340
  19. 600
  20. 588
  21. 392
  22. 248
  23. 524
  24. 584
  25. 56
  26. 456
  27. 464
  28. 88
  29. 472
  30. 472
  31. 492
  32. 624
  33. 472
  34. 176
  35. 256
  36. 100
  37. 72
  38. 416
  39. 456
  40. 544

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