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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 419 · 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. 1.18 × 8 =
  2. 2.18 × 4 =
  3. 3.39 × 4 =
  4. 4.124 × 4 =
  5. 5.150 × 4 =
  6. 6.61 × 8 =
  7. 7.78 × 4 =
  8. 8.31 × 4 =
  9. 9.160 × 4 =
  10. 10.44 × 8 =
  11. 11.52 × 8 =
  12. 12.18 × 8 =
  13. 13.137 × 4 =
  14. 14.22 × 4 =
  15. 15.155 × 4 =
  16. 16.25 × 8 =
  17. 17.160 × 4 =
  18. 18.31 × 8 =
  19. 19.160 × 4 =
  20. 20.60 × 4 =
  21. 21.33 × 8 =
  22. 22.64 × 8 =
  23. 23.35 × 8 =
  24. 24.50 × 8 =
  25. 25.63 × 8 =
  26. 26.104 × 4 =
  27. 27.44 × 8 =
  28. 28.61 × 8 =
  29. 29.103 × 4 =
  30. 30.38 × 8 =
  31. 31.14 × 8 =
  32. 32.23 × 8 =
  33. 33.73 × 8 =
  34. 34.102 × 4 =
  35. 35.149 × 4 =
  36. 36.145 × 4 =
  37. 37.37 × 4 =
  38. 38.16 × 4 =
  39. 39.37 × 4 =
  40. 40.38 × 4 =

Answer key

  1. 144
  2. 72
  3. 156
  4. 496
  5. 600
  6. 488
  7. 312
  8. 124
  9. 640
  10. 352
  11. 416
  12. 144
  13. 548
  14. 88
  15. 620
  16. 200
  17. 640
  18. 248
  19. 640
  20. 240
  21. 264
  22. 512
  23. 280
  24. 400
  25. 504
  26. 416
  27. 352
  28. 488
  29. 412
  30. 304
  31. 112
  32. 184
  33. 584
  34. 408
  35. 596
  36. 580
  37. 148
  38. 64
  39. 148
  40. 152

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