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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 221 · 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. 1.30 × 8 =
  2. 2.156 × 4 =
  3. 3.41 × 4 =
  4. 4.150 × 4 =
  5. 5.74 × 8 =
  6. 6.72 × 8 =
  7. 7.68 × 8 =
  8. 8.54 × 8 =
  9. 9.48 × 8 =
  10. 10.30 × 8 =
  11. 11.114 × 4 =
  12. 12.31 × 8 =
  13. 13.67 × 8 =
  14. 14.36 × 8 =
  15. 15.33 × 4 =
  16. 16.24 × 8 =
  17. 17.24 × 8 =
  18. 18.15 × 4 =
  19. 19.24 × 8 =
  20. 20.47 × 4 =
  21. 21.65 × 8 =
  22. 22.44 × 8 =
  23. 23.74 × 8 =
  24. 24.21 × 8 =
  25. 25.39 × 4 =
  26. 26.68 × 4 =
  27. 27.26 × 8 =
  28. 28.21 × 8 =
  29. 29.13 × 8 =
  30. 30.142 × 4 =
  31. 31.145 × 4 =
  32. 32.70 × 4 =
  33. 33.62 × 8 =
  34. 34.29 × 8 =
  35. 35.145 × 4 =
  36. 36.90 × 4 =
  37. 37.42 × 4 =
  38. 38.56 × 8 =
  39. 39.95 × 4 =
  40. 40.153 × 4 =

Answer key

  1. 240
  2. 624
  3. 164
  4. 600
  5. 592
  6. 576
  7. 544
  8. 432
  9. 384
  10. 240
  11. 456
  12. 248
  13. 536
  14. 288
  15. 132
  16. 192
  17. 192
  18. 60
  19. 192
  20. 188
  21. 520
  22. 352
  23. 592
  24. 168
  25. 156
  26. 272
  27. 208
  28. 168
  29. 104
  30. 568
  31. 580
  32. 280
  33. 496
  34. 232
  35. 580
  36. 360
  37. 168
  38. 448
  39. 380
  40. 612

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