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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 778 · 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. 1.140 × 4 =
  2. 2.77 × 4 =
  3. 3.54 × 4 =
  4. 4.54 × 4 =
  5. 5.63 × 8 =
  6. 6.55 × 8 =
  7. 7.28 × 8 =
  8. 8.48 × 4 =
  9. 9.70 × 4 =
  10. 10.76 × 4 =
  11. 11.53 × 8 =
  12. 12.51 × 8 =
  13. 13.36 × 8 =
  14. 14.42 × 8 =
  15. 15.44 × 8 =
  16. 16.45 × 8 =
  17. 17.24 × 8 =
  18. 18.123 × 4 =
  19. 19.52 × 8 =
  20. 20.14 × 8 =
  21. 21.32 × 8 =
  22. 22.48 × 8 =
  23. 23.104 × 4 =
  24. 24.42 × 4 =
  25. 25.64 × 8 =
  26. 26.77 × 4 =
  27. 27.19 × 8 =
  28. 28.73 × 8 =
  29. 29.156 × 4 =
  30. 30.15 × 8 =
  31. 31.122 × 4 =
  32. 32.55 × 8 =
  33. 33.76 × 4 =
  34. 34.12 × 8 =
  35. 35.98 × 4 =
  36. 36.30 × 8 =
  37. 37.106 × 4 =
  38. 38.134 × 4 =
  39. 39.27 × 8 =
  40. 40.34 × 4 =

Answer key

  1. 560
  2. 308
  3. 216
  4. 216
  5. 504
  6. 440
  7. 224
  8. 192
  9. 280
  10. 304
  11. 424
  12. 408
  13. 288
  14. 336
  15. 352
  16. 360
  17. 192
  18. 492
  19. 416
  20. 112
  21. 256
  22. 384
  23. 416
  24. 168
  25. 512
  26. 308
  27. 152
  28. 584
  29. 624
  30. 120
  31. 488
  32. 440
  33. 304
  34. 96
  35. 392
  36. 240
  37. 424
  38. 536
  39. 216
  40. 136

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