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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 128 · 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. 1.33 × 8 =
  2. 2.40 × 8 =
  3. 3.95 × 4 =
  4. 4.28 × 4 =
  5. 5.126 × 4 =
  6. 6.45 × 4 =
  7. 7.18 × 8 =
  8. 8.68 × 8 =
  9. 9.41 × 4 =
  10. 10.32 × 8 =
  11. 11.67 × 8 =
  12. 12.49 × 8 =
  13. 13.57 × 8 =
  14. 14.64 × 4 =
  15. 15.104 × 4 =
  16. 16.18 × 8 =
  17. 17.55 × 8 =
  18. 18.14 × 4 =
  19. 19.155 × 4 =
  20. 20.52 × 4 =
  21. 21.59 × 8 =
  22. 22.65 × 8 =
  23. 23.53 × 4 =
  24. 24.93 × 4 =
  25. 25.72 × 4 =
  26. 26.59 × 4 =
  27. 27.157 × 4 =
  28. 28.48 × 8 =
  29. 29.35 × 4 =
  30. 30.28 × 8 =
  31. 31.147 × 4 =
  32. 32.14 × 8 =
  33. 33.41 × 8 =
  34. 34.94 × 4 =
  35. 35.28 × 8 =
  36. 36.153 × 4 =
  37. 37.75 × 8 =
  38. 38.33 × 8 =
  39. 39.92 × 4 =
  40. 40.19 × 4 =

Answer key

  1. 264
  2. 320
  3. 380
  4. 112
  5. 504
  6. 180
  7. 144
  8. 544
  9. 164
  10. 256
  11. 536
  12. 392
  13. 456
  14. 256
  15. 416
  16. 144
  17. 440
  18. 56
  19. 620
  20. 208
  21. 472
  22. 520
  23. 212
  24. 372
  25. 288
  26. 236
  27. 628
  28. 384
  29. 140
  30. 224
  31. 588
  32. 112
  33. 328
  34. 376
  35. 224
  36. 612
  37. 600
  38. 264
  39. 368
  40. 76

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