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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 643 · 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. 1.67 × 4 =
  2. 2.35 × 8 =
  3. 3.29 × 4 =
  4. 4.27 × 4 =
  5. 5.29 × 8 =
  6. 6.56 × 4 =
  7. 7.52 × 8 =
  8. 8.148 × 4 =
  9. 9.100 × 4 =
  10. 10.32 × 4 =
  11. 11.18 × 8 =
  12. 12.75 × 8 =
  13. 13.134 × 4 =
  14. 14.25 × 8 =
  15. 15.74 × 8 =
  16. 16.64 × 8 =
  17. 17.70 × 4 =
  18. 18.140 × 4 =
  19. 19.42 × 8 =
  20. 20.22 × 8 =
  21. 21.25 × 8 =
  22. 22.135 × 4 =
  23. 23.29 × 8 =
  24. 24.27 × 4 =
  25. 25.21 × 8 =
  26. 26.20 × 4 =
  27. 27.44 × 8 =
  28. 28.35 × 8 =
  29. 29.60 × 8 =
  30. 30.20 × 8 =
  31. 31.26 × 8 =
  32. 32.14 × 8 =
  33. 33.52 × 8 =
  34. 34.13 × 8 =
  35. 35.34 × 4 =
  36. 36.106 × 4 =
  37. 37.106 × 4 =
  38. 38.33 × 8 =
  39. 39.120 × 4 =
  40. 40.87 × 4 =

Answer key

  1. 268
  2. 280
  3. 116
  4. 108
  5. 232
  6. 224
  7. 416
  8. 592
  9. 400
  10. 128
  11. 144
  12. 600
  13. 536
  14. 200
  15. 592
  16. 512
  17. 280
  18. 560
  19. 336
  20. 176
  21. 200
  22. 540
  23. 232
  24. 108
  25. 168
  26. 80
  27. 352
  28. 280
  29. 480
  30. 160
  31. 208
  32. 112
  33. 416
  34. 104
  35. 136
  36. 424
  37. 424
  38. 264
  39. 480
  40. 348

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