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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 490 · 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. 1.28 × 8 =
  2. 2.52 × 8 =
  3. 3.46 × 8 =
  4. 4.23 × 8 =
  5. 5.32 × 4 =
  6. 6.71 × 4 =
  7. 7.68 × 8 =
  8. 8.133 × 4 =
  9. 9.13 × 4 =
  10. 10.24 × 8 =
  11. 11.133 × 4 =
  12. 12.88 × 4 =
  13. 13.14 × 8 =
  14. 14.31 × 8 =
  15. 15.61 × 4 =
  16. 16.123 × 4 =
  17. 17.59 × 8 =
  18. 18.52 × 8 =
  19. 19.57 × 8 =
  20. 20.67 × 4 =
  21. 21.159 × 4 =
  22. 22.70 × 8 =
  23. 23.47 × 8 =
  24. 24.30 × 4 =
  25. 25.29 × 8 =
  26. 26.123 × 4 =
  27. 27.64 × 8 =
  28. 28.45 × 8 =
  29. 29.116 × 4 =
  30. 30.19 × 8 =
  31. 31.85 × 4 =
  32. 32.26 × 8 =
  33. 33.42 × 4 =
  34. 34.60 × 4 =
  35. 35.158 × 4 =
  36. 36.50 × 8 =
  37. 37.16 × 4 =
  38. 38.43 × 8 =
  39. 39.50 × 8 =
  40. 40.91 × 4 =

Answer key

  1. 224
  2. 416
  3. 368
  4. 184
  5. 128
  6. 284
  7. 544
  8. 532
  9. 52
  10. 192
  11. 532
  12. 352
  13. 112
  14. 248
  15. 244
  16. 492
  17. 472
  18. 416
  19. 456
  20. 268
  21. 636
  22. 560
  23. 376
  24. 120
  25. 232
  26. 492
  27. 512
  28. 360
  29. 464
  30. 152
  31. 340
  32. 208
  33. 168
  34. 240
  35. 632
  36. 400
  37. 64
  38. 344
  39. 400
  40. 364

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