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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 42 · 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. 1.123 × 4 =
  2. 2.31 × 8 =
  3. 3.51 × 4 =
  4. 4.66 × 8 =
  5. 5.57 × 8 =
  6. 6.73 × 8 =
  7. 7.16 × 4 =
  8. 8.75 × 8 =
  9. 9.65 × 8 =
  10. 10.63 × 8 =
  11. 11.98 × 4 =
  12. 12.19 × 4 =
  13. 13.18 × 8 =
  14. 14.78 × 4 =
  15. 15.54 × 4 =
  16. 16.42 × 8 =
  17. 17.67 × 8 =
  18. 18.33 × 4 =
  19. 19.129 × 4 =
  20. 20.30 × 4 =
  21. 21.67 × 8 =
  22. 22.102 × 4 =
  23. 23.64 × 8 =
  24. 24.24 × 8 =
  25. 25.26 × 8 =
  26. 26.39 × 4 =
  27. 27.12 × 8 =
  28. 28.153 × 4 =
  29. 29.43 × 8 =
  30. 30.114 × 4 =
  31. 31.61 × 4 =
  32. 32.62 × 8 =
  33. 33.59 × 8 =
  34. 34.56 × 8 =
  35. 35.29 × 8 =
  36. 36.101 × 4 =
  37. 37.28 × 8 =
  38. 38.68 × 8 =
  39. 39.156 × 4 =
  40. 40.37 × 4 =

Answer key

  1. 492
  2. 248
  3. 204
  4. 528
  5. 456
  6. 584
  7. 64
  8. 600
  9. 520
  10. 504
  11. 392
  12. 76
  13. 144
  14. 312
  15. 216
  16. 336
  17. 536
  18. 132
  19. 516
  20. 120
  21. 536
  22. 408
  23. 512
  24. 192
  25. 208
  26. 156
  27. 96
  28. 612
  29. 344
  30. 456
  31. 244
  32. 496
  33. 472
  34. 448
  35. 232
  36. 404
  37. 224
  38. 544
  39. 624
  40. 148

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