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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 646 · 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. 1.48 × 4 =
  2. 2.37 × 4 =
  3. 3.47 × 8 =
  4. 4.105 × 4 =
  5. 5.25 × 8 =
  6. 6.52 × 8 =
  7. 7.116 × 4 =
  8. 8.54 × 4 =
  9. 9.93 × 4 =
  10. 10.49 × 8 =
  11. 11.99 × 4 =
  12. 12.42 × 8 =
  13. 13.39 × 8 =
  14. 14.157 × 4 =
  15. 15.75 × 8 =
  16. 16.58 × 8 =
  17. 17.30 × 4 =
  18. 18.37 × 4 =
  19. 19.132 × 4 =
  20. 20.92 × 4 =
  21. 21.24 × 4 =
  22. 22.24 × 8 =
  23. 23.119 × 4 =
  24. 24.52 × 8 =
  25. 25.16 × 8 =
  26. 26.43 × 4 =
  27. 27.25 × 4 =
  28. 28.140 × 4 =
  29. 29.40 × 8 =
  30. 30.144 × 4 =
  31. 31.134 × 4 =
  32. 32.45 × 8 =
  33. 33.35 × 4 =
  34. 34.74 × 8 =
  35. 35.32 × 4 =
  36. 36.19 × 4 =
  37. 37.127 × 4 =
  38. 38.145 × 4 =
  39. 39.47 × 8 =
  40. 40.119 × 4 =

Answer key

  1. 192
  2. 148
  3. 376
  4. 420
  5. 200
  6. 416
  7. 464
  8. 216
  9. 372
  10. 392
  11. 396
  12. 336
  13. 312
  14. 628
  15. 600
  16. 464
  17. 120
  18. 148
  19. 528
  20. 368
  21. 96
  22. 192
  23. 476
  24. 416
  25. 128
  26. 172
  27. 100
  28. 560
  29. 320
  30. 576
  31. 536
  32. 360
  33. 140
  34. 592
  35. 128
  36. 76
  37. 508
  38. 580
  39. 376
  40. 476

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