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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 521 · 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. 1.25 × 4 =
  2. 2.72 × 8 =
  3. 3.73 × 8 =
  4. 4.63 × 8 =
  5. 5.19 × 4 =
  6. 6.155 × 4 =
  7. 7.83 × 4 =
  8. 8.28 × 4 =
  9. 9.67 × 8 =
  10. 10.53 × 8 =
  11. 11.69 × 4 =
  12. 12.20 × 4 =
  13. 13.14 × 8 =
  14. 14.95 × 4 =
  15. 15.26 × 8 =
  16. 16.149 × 4 =
  17. 17.149 × 4 =
  18. 18.23 × 8 =
  19. 19.151 × 4 =
  20. 20.121 × 4 =
  21. 21.67 × 8 =
  22. 22.86 × 4 =
  23. 23.26 × 8 =
  24. 24.34 × 4 =
  25. 25.120 × 4 =
  26. 26.13 × 8 =
  27. 27.85 × 4 =
  28. 28.50 × 8 =
  29. 29.27 × 8 =
  30. 30.12 × 8 =
  31. 31.67 × 8 =
  32. 32.138 × 4 =
  33. 33.19 × 4 =
  34. 34.95 × 4 =
  35. 35.159 × 4 =
  36. 36.88 × 4 =
  37. 37.138 × 4 =
  38. 38.62 × 8 =
  39. 39.83 × 4 =
  40. 40.21 × 8 =

Answer key

  1. 100
  2. 576
  3. 584
  4. 504
  5. 76
  6. 620
  7. 332
  8. 112
  9. 536
  10. 424
  11. 276
  12. 80
  13. 112
  14. 380
  15. 208
  16. 596
  17. 596
  18. 184
  19. 604
  20. 484
  21. 536
  22. 344
  23. 208
  24. 136
  25. 480
  26. 104
  27. 340
  28. 400
  29. 216
  30. 96
  31. 536
  32. 552
  33. 76
  34. 380
  35. 636
  36. 352
  37. 552
  38. 496
  39. 332
  40. 168

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