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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 512 · 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 × 4 =
  2. 2.62 × 4 =
  3. 3.117 × 4 =
  4. 4.28 × 4 =
  5. 5.20 × 8 =
  6. 6.74 × 4 =
  7. 7.100 × 4 =
  8. 8.50 × 8 =
  9. 9.60 × 8 =
  10. 10.48 × 8 =
  11. 11.16 × 8 =
  12. 12.23 × 8 =
  13. 13.90 × 4 =
  14. 14.145 × 4 =
  15. 15.28 × 8 =
  16. 16.23 × 8 =
  17. 17.25 × 4 =
  18. 18.24 × 4 =
  19. 19.12 × 8 =
  20. 20.60 × 8 =
  21. 21.24 × 8 =
  22. 22.49 × 8 =
  23. 23.49 × 8 =
  24. 24.71 × 8 =
  25. 25.52 × 8 =
  26. 26.60 × 8 =
  27. 27.156 × 4 =
  28. 28.52 × 4 =
  29. 29.84 × 4 =
  30. 30.32 × 8 =
  31. 31.149 × 4 =
  32. 32.38 × 4 =
  33. 33.74 × 8 =
  34. 34.43 × 4 =
  35. 35.61 × 4 =
  36. 36.36 × 4 =
  37. 37.21 × 4 =
  38. 38.57 × 8 =
  39. 39.49 × 4 =
  40. 40.24 × 8 =

Answer key

  1. 140
  2. 248
  3. 468
  4. 112
  5. 160
  6. 296
  7. 400
  8. 400
  9. 480
  10. 384
  11. 128
  12. 184
  13. 360
  14. 580
  15. 224
  16. 184
  17. 100
  18. 96
  19. 96
  20. 480
  21. 192
  22. 392
  23. 392
  24. 568
  25. 416
  26. 480
  27. 624
  28. 208
  29. 336
  30. 256
  31. 596
  32. 152
  33. 592
  34. 172
  35. 244
  36. 144
  37. 84
  38. 456
  39. 196
  40. 192

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