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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 786 · 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. 1.29 × 4 =
  2. 2.28 × 4 =
  3. 3.97 × 4 =
  4. 4.32 × 8 =
  5. 5.62 × 4 =
  6. 6.102 × 4 =
  7. 7.42 × 4 =
  8. 8.53 × 4 =
  9. 9.139 × 4 =
  10. 10.60 × 8 =
  11. 11.155 × 4 =
  12. 12.75 × 4 =
  13. 13.65 × 8 =
  14. 14.66 × 8 =
  15. 15.51 × 4 =
  16. 16.24 × 4 =
  17. 17.48 × 8 =
  18. 18.47 × 8 =
  19. 19.37 × 8 =
  20. 20.71 × 4 =
  21. 21.53 × 8 =
  22. 22.88 × 4 =
  23. 23.82 × 4 =
  24. 24.103 × 4 =
  25. 25.40 × 4 =
  26. 26.25 × 8 =
  27. 27.139 × 4 =
  28. 28.123 × 4 =
  29. 29.98 × 4 =
  30. 30.87 × 4 =
  31. 31.51 × 8 =
  32. 32.65 × 8 =
  33. 33.104 × 4 =
  34. 34.34 × 8 =
  35. 35.56 × 8 =
  36. 36.15 × 8 =
  37. 37.62 × 8 =
  38. 38.13 × 8 =
  39. 39.60 × 4 =
  40. 40.130 × 4 =

Answer key

  1. 116
  2. 112
  3. 388
  4. 256
  5. 248
  6. 408
  7. 168
  8. 212
  9. 556
  10. 480
  11. 620
  12. 300
  13. 520
  14. 528
  15. 204
  16. 96
  17. 384
  18. 376
  19. 296
  20. 284
  21. 424
  22. 352
  23. 328
  24. 412
  25. 160
  26. 200
  27. 556
  28. 492
  29. 392
  30. 348
  31. 408
  32. 520
  33. 416
  34. 272
  35. 448
  36. 120
  37. 496
  38. 104
  39. 240
  40. 520

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