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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 642 · 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. 1.19 × 8 =
  2. 2.16 × 8 =
  3. 3.21 × 8 =
  4. 4.23 × 4 =
  5. 5.39 × 4 =
  6. 6.42 × 8 =
  7. 7.26 × 4 =
  8. 8.143 × 4 =
  9. 9.43 × 8 =
  10. 10.96 × 4 =
  11. 11.22 × 8 =
  12. 12.32 × 8 =
  13. 13.73 × 4 =
  14. 14.57 × 4 =
  15. 15.67 × 8 =
  16. 16.67 × 8 =
  17. 17.13 × 8 =
  18. 18.46 × 4 =
  19. 19.158 × 4 =
  20. 20.44 × 8 =
  21. 21.141 × 4 =
  22. 22.146 × 4 =
  23. 23.40 × 8 =
  24. 24.100 × 4 =
  25. 25.69 × 8 =
  26. 26.95 × 4 =
  27. 27.65 × 8 =
  28. 28.63 × 4 =
  29. 29.51 × 4 =
  30. 30.37 × 8 =
  31. 31.44 × 4 =
  32. 32.37 × 8 =
  33. 33.103 × 4 =
  34. 34.67 × 4 =
  35. 35.54 × 8 =
  36. 36.134 × 4 =
  37. 37.152 × 4 =
  38. 38.152 × 4 =
  39. 39.37 × 4 =
  40. 40.34 × 8 =

Answer key

  1. 152
  2. 128
  3. 168
  4. 92
  5. 156
  6. 336
  7. 104
  8. 572
  9. 344
  10. 384
  11. 176
  12. 256
  13. 292
  14. 228
  15. 536
  16. 536
  17. 104
  18. 184
  19. 632
  20. 352
  21. 564
  22. 584
  23. 320
  24. 400
  25. 552
  26. 380
  27. 520
  28. 252
  29. 204
  30. 296
  31. 176
  32. 296
  33. 412
  34. 268
  35. 432
  36. 536
  37. 608
  38. 608
  39. 148
  40. 272

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