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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 361 · 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. 1.122 × 4 =
  2. 2.42 × 8 =
  3. 3.28 × 8 =
  4. 4.157 × 4 =
  5. 5.37 × 4 =
  6. 6.19 × 4 =
  7. 7.33 × 8 =
  8. 8.130 × 4 =
  9. 9.43 × 8 =
  10. 10.64 × 8 =
  11. 11.70 × 4 =
  12. 12.160 × 4 =
  13. 13.79 × 4 =
  14. 14.32 × 4 =
  15. 15.15 × 8 =
  16. 16.52 × 8 =
  17. 17.28 × 4 =
  18. 18.156 × 4 =
  19. 19.92 × 4 =
  20. 20.64 × 8 =
  21. 21.85 × 4 =
  22. 22.91 × 4 =
  23. 23.43 × 8 =
  24. 24.93 × 4 =
  25. 25.129 × 4 =
  26. 26.39 × 8 =
  27. 27.64 × 4 =
  28. 28.36 × 8 =
  29. 29.13 × 8 =
  30. 30.113 × 4 =
  31. 31.40 × 8 =
  32. 32.63 × 8 =
  33. 33.112 × 4 =
  34. 34.124 × 4 =
  35. 35.23 × 8 =
  36. 36.35 × 4 =
  37. 37.27 × 8 =
  38. 38.26 × 8 =
  39. 39.39 × 8 =
  40. 40.150 × 4 =

Answer key

  1. 488
  2. 336
  3. 224
  4. 628
  5. 148
  6. 76
  7. 264
  8. 520
  9. 344
  10. 512
  11. 280
  12. 640
  13. 316
  14. 128
  15. 120
  16. 416
  17. 112
  18. 624
  19. 368
  20. 512
  21. 340
  22. 364
  23. 344
  24. 372
  25. 516
  26. 312
  27. 256
  28. 288
  29. 104
  30. 452
  31. 320
  32. 504
  33. 448
  34. 496
  35. 184
  36. 140
  37. 216
  38. 208
  39. 312
  40. 600

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