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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 810 · 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. 1.50 × 4 =
  2. 2.149 × 4 =
  3. 3.19 × 4 =
  4. 4.21 × 4 =
  5. 5.46 × 4 =
  6. 6.112 × 4 =
  7. 7.20 × 4 =
  8. 8.19 × 4 =
  9. 9.95 × 4 =
  10. 10.141 × 4 =
  11. 11.128 × 4 =
  12. 12.32 × 4 =
  13. 13.62 × 8 =
  14. 14.31 × 8 =
  15. 15.67 × 8 =
  16. 16.86 × 4 =
  17. 17.23 × 8 =
  18. 18.35 × 4 =
  19. 19.155 × 4 =
  20. 20.33 × 8 =
  21. 21.138 × 4 =
  22. 22.145 × 4 =
  23. 23.54 × 8 =
  24. 24.42 × 4 =
  25. 25.66 × 8 =
  26. 26.29 × 8 =
  27. 27.36 × 8 =
  28. 28.23 × 8 =
  29. 29.75 × 8 =
  30. 30.16 × 8 =
  31. 31.86 × 4 =
  32. 32.43 × 8 =
  33. 33.63 × 4 =
  34. 34.44 × 4 =
  35. 35.29 × 4 =
  36. 36.50 × 4 =
  37. 37.75 × 8 =
  38. 38.64 × 8 =
  39. 39.117 × 4 =
  40. 40.122 × 4 =

Answer key

  1. 200
  2. 596
  3. 76
  4. 84
  5. 184
  6. 448
  7. 80
  8. 76
  9. 380
  10. 564
  11. 512
  12. 128
  13. 496
  14. 248
  15. 536
  16. 344
  17. 184
  18. 140
  19. 620
  20. 264
  21. 552
  22. 580
  23. 432
  24. 168
  25. 528
  26. 232
  27. 288
  28. 184
  29. 600
  30. 128
  31. 344
  32. 344
  33. 252
  34. 176
  35. 116
  36. 200
  37. 600
  38. 512
  39. 468
  40. 488

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