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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 511 · 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. 1.31 × 4 =
  2. 2.102 × 4 =
  3. 3.30 × 4 =
  4. 4.71 × 8 =
  5. 5.15 × 8 =
  6. 6.74 × 4 =
  7. 7.62 × 8 =
  8. 8.72 × 8 =
  9. 9.25 × 8 =
  10. 10.63 × 8 =
  11. 11.29 × 8 =
  12. 12.115 × 4 =
  13. 13.15 × 4 =
  14. 14.30 × 4 =
  15. 15.69 × 8 =
  16. 16.90 × 4 =
  17. 17.63 × 4 =
  18. 18.90 × 4 =
  19. 19.16 × 4 =
  20. 20.143 × 4 =
  21. 21.83 × 4 =
  22. 22.29 × 8 =
  23. 23.26 × 4 =
  24. 24.19 × 8 =
  25. 25.17 × 8 =
  26. 26.155 × 4 =
  27. 27.71 × 8 =
  28. 28.71 × 8 =
  29. 29.71 × 8 =
  30. 30.122 × 4 =
  31. 31.63 × 8 =
  32. 32.45 × 8 =
  33. 33.107 × 4 =
  34. 34.74 × 8 =
  35. 35.63 × 8 =
  36. 36.47 × 8 =
  37. 37.25 × 8 =
  38. 38.23 × 4 =
  39. 39.96 × 4 =
  40. 40.143 × 4 =

Answer key

  1. 124
  2. 408
  3. 120
  4. 568
  5. 120
  6. 296
  7. 496
  8. 576
  9. 200
  10. 504
  11. 232
  12. 460
  13. 60
  14. 120
  15. 552
  16. 360
  17. 252
  18. 360
  19. 64
  20. 572
  21. 332
  22. 232
  23. 104
  24. 152
  25. 136
  26. 620
  27. 568
  28. 568
  29. 568
  30. 488
  31. 504
  32. 360
  33. 428
  34. 592
  35. 504
  36. 376
  37. 200
  38. 92
  39. 384
  40. 572

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