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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 785 · 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. 1.155 × 4 =
  2. 2.153 × 4 =
  3. 3.15 × 8 =
  4. 4.25 × 8 =
  5. 5.67 × 4 =
  6. 6.67 × 8 =
  7. 7.17 × 8 =
  8. 8.75 × 8 =
  9. 9.55 × 8 =
  10. 10.87 × 4 =
  11. 11.58 × 8 =
  12. 12.154 × 4 =
  13. 13.17 × 8 =
  14. 14.107 × 4 =
  15. 15.18 × 8 =
  16. 16.55 × 8 =
  17. 17.131 × 4 =
  18. 18.59 × 8 =
  19. 19.26 × 8 =
  20. 20.60 × 4 =
  21. 21.160 × 4 =
  22. 22.119 × 4 =
  23. 23.91 × 4 =
  24. 24.108 × 4 =
  25. 25.145 × 4 =
  26. 26.14 × 4 =
  27. 27.31 × 8 =
  28. 28.42 × 4 =
  29. 29.132 × 4 =
  30. 30.35 × 8 =
  31. 31.50 × 8 =
  32. 32.16 × 4 =
  33. 33.62 × 8 =
  34. 34.135 × 4 =
  35. 35.62 × 8 =
  36. 36.47 × 8 =
  37. 37.59 × 4 =
  38. 38.70 × 4 =
  39. 39.147 × 4 =
  40. 40.54 × 8 =

Answer key

  1. 620
  2. 612
  3. 120
  4. 200
  5. 268
  6. 536
  7. 136
  8. 600
  9. 440
  10. 348
  11. 464
  12. 616
  13. 136
  14. 428
  15. 144
  16. 440
  17. 524
  18. 472
  19. 208
  20. 240
  21. 640
  22. 476
  23. 364
  24. 432
  25. 580
  26. 56
  27. 248
  28. 168
  29. 528
  30. 280
  31. 400
  32. 64
  33. 496
  34. 540
  35. 496
  36. 376
  37. 236
  38. 280
  39. 588
  40. 432

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