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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 309 · 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. 1.35 × 8 =
  2. 2.42 × 8 =
  3. 3.103 × 4 =
  4. 4.70 × 4 =
  5. 5.62 × 8 =
  6. 6.92 × 4 =
  7. 7.39 × 8 =
  8. 8.81 × 4 =
  9. 9.29 × 8 =
  10. 10.50 × 4 =
  11. 11.155 × 4 =
  12. 12.70 × 8 =
  13. 13.49 × 8 =
  14. 14.25 × 4 =
  15. 15.44 × 8 =
  16. 16.148 × 4 =
  17. 17.141 × 4 =
  18. 18.42 × 8 =
  19. 19.21 × 8 =
  20. 20.61 × 4 =
  21. 21.68 × 8 =
  22. 22.129 × 4 =
  23. 23.154 × 4 =
  24. 24.88 × 4 =
  25. 25.29 × 8 =
  26. 26.139 × 4 =
  27. 27.12 × 8 =
  28. 28.160 × 4 =
  29. 29.14 × 8 =
  30. 30.53 × 8 =
  31. 31.38 × 8 =
  32. 32.51 × 8 =
  33. 33.47 × 4 =
  34. 34.20 × 8 =
  35. 35.115 × 4 =
  36. 36.64 × 8 =
  37. 37.102 × 4 =
  38. 38.58 × 8 =
  39. 39.25 × 8 =
  40. 40.28 × 8 =

Answer key

  1. 280
  2. 336
  3. 412
  4. 280
  5. 496
  6. 368
  7. 312
  8. 324
  9. 232
  10. 200
  11. 620
  12. 560
  13. 392
  14. 100
  15. 352
  16. 592
  17. 564
  18. 336
  19. 168
  20. 244
  21. 544
  22. 516
  23. 616
  24. 352
  25. 232
  26. 556
  27. 96
  28. 640
  29. 112
  30. 424
  31. 304
  32. 408
  33. 188
  34. 160
  35. 460
  36. 512
  37. 408
  38. 464
  39. 200
  40. 224

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