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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 399 · 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. 1.81 × 4 =
  2. 2.73 × 4 =
  3. 3.23 × 4 =
  4. 4.48 × 8 =
  5. 5.17 × 4 =
  6. 6.25 × 8 =
  7. 7.67 × 8 =
  8. 8.130 × 4 =
  9. 9.61 × 8 =
  10. 10.117 × 4 =
  11. 11.78 × 4 =
  12. 12.24 × 8 =
  13. 13.18 × 8 =
  14. 14.57 × 8 =
  15. 15.15 × 8 =
  16. 16.70 × 4 =
  17. 17.70 × 4 =
  18. 18.149 × 4 =
  19. 19.75 × 8 =
  20. 20.37 × 8 =
  21. 21.35 × 4 =
  22. 22.84 × 4 =
  23. 23.52 × 8 =
  24. 24.110 × 4 =
  25. 25.151 × 4 =
  26. 26.46 × 8 =
  27. 27.44 × 4 =
  28. 28.152 × 4 =
  29. 29.85 × 4 =
  30. 30.42 × 8 =
  31. 31.65 × 8 =
  32. 32.45 × 4 =
  33. 33.73 × 8 =
  34. 34.26 × 8 =
  35. 35.153 × 4 =
  36. 36.110 × 4 =
  37. 37.155 × 4 =
  38. 38.124 × 4 =
  39. 39.17 × 8 =
  40. 40.138 × 4 =

Answer key

  1. 324
  2. 292
  3. 92
  4. 384
  5. 68
  6. 200
  7. 536
  8. 520
  9. 488
  10. 468
  11. 312
  12. 192
  13. 144
  14. 456
  15. 120
  16. 280
  17. 280
  18. 596
  19. 600
  20. 296
  21. 140
  22. 336
  23. 416
  24. 440
  25. 604
  26. 368
  27. 176
  28. 608
  29. 340
  30. 336
  31. 520
  32. 180
  33. 584
  34. 208
  35. 612
  36. 440
  37. 620
  38. 496
  39. 136
  40. 552

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