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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 117 · 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. 1.159 × 4 =
  2. 2.29 × 4 =
  3. 3.32 × 8 =
  4. 4.91 × 4 =
  5. 5.128 × 4 =
  6. 6.59 × 8 =
  7. 7.21 × 8 =
  8. 8.70 × 4 =
  9. 9.65 × 4 =
  10. 10.45 × 8 =
  11. 11.25 × 8 =
  12. 12.30 × 8 =
  13. 13.40 × 8 =
  14. 14.57 × 8 =
  15. 15.30 × 8 =
  16. 16.43 × 4 =
  17. 17.62 × 8 =
  18. 18.41 × 4 =
  19. 19.42 × 8 =
  20. 20.15 × 4 =
  21. 21.108 × 4 =
  22. 22.16 × 8 =
  23. 23.106 × 4 =
  24. 24.29 × 4 =
  25. 25.25 × 8 =
  26. 26.56 × 8 =
  27. 27.104 × 4 =
  28. 28.20 × 8 =
  29. 29.66 × 4 =
  30. 30.44 × 8 =
  31. 31.125 × 4 =
  32. 32.136 × 4 =
  33. 33.69 × 8 =
  34. 34.115 × 4 =
  35. 35.63 × 8 =
  36. 36.21 × 4 =
  37. 37.12 × 8 =
  38. 38.74 × 4 =
  39. 39.47 × 4 =
  40. 40.43 × 8 =

Answer key

  1. 636
  2. 116
  3. 256
  4. 364
  5. 512
  6. 472
  7. 168
  8. 280
  9. 260
  10. 360
  11. 200
  12. 240
  13. 320
  14. 456
  15. 240
  16. 172
  17. 496
  18. 164
  19. 336
  20. 60
  21. 432
  22. 128
  23. 424
  24. 116
  25. 200
  26. 448
  27. 416
  28. 160
  29. 264
  30. 352
  31. 500
  32. 544
  33. 552
  34. 460
  35. 504
  36. 84
  37. 96
  38. 296
  39. 188
  40. 344

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