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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 20 · 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. 1.72 × 8 =
  2. 2.103 × 4 =
  3. 3.60 × 4 =
  4. 4.53 × 8 =
  5. 5.35 × 8 =
  6. 6.41 × 8 =
  7. 7.36 × 4 =
  8. 8.39 × 4 =
  9. 9.46 × 8 =
  10. 10.155 × 4 =
  11. 11.53 × 8 =
  12. 12.18 × 8 =
  13. 13.15 × 4 =
  14. 14.67 × 4 =
  15. 15.14 × 8 =
  16. 16.111 × 4 =
  17. 17.61 × 8 =
  18. 18.160 × 4 =
  19. 19.71 × 8 =
  20. 20.14 × 8 =
  21. 21.13 × 8 =
  22. 22.102 × 4 =
  23. 23.15 × 8 =
  24. 24.62 × 8 =
  25. 25.71 × 8 =
  26. 26.105 × 4 =
  27. 27.32 × 4 =
  28. 28.138 × 4 =
  29. 29.153 × 4 =
  30. 30.23 × 4 =
  31. 31.141 × 4 =
  32. 32.110 × 4 =
  33. 33.43 × 8 =
  34. 34.61 × 8 =
  35. 35.51 × 4 =
  36. 36.35 × 4 =
  37. 37.31 × 8 =
  38. 38.39 × 4 =
  39. 39.64 × 8 =
  40. 40.33 × 8 =

Answer key

  1. 576
  2. 412
  3. 240
  4. 424
  5. 280
  6. 328
  7. 144
  8. 156
  9. 368
  10. 620
  11. 424
  12. 144
  13. 60
  14. 268
  15. 112
  16. 444
  17. 488
  18. 640
  19. 568
  20. 112
  21. 104
  22. 408
  23. 120
  24. 496
  25. 568
  26. 420
  27. 128
  28. 552
  29. 612
  30. 92
  31. 564
  32. 440
  33. 344
  34. 488
  35. 204
  36. 140
  37. 248
  38. 156
  39. 512
  40. 264

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