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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 565 · 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. 1.101 × 4 =
  2. 2.18 × 4 =
  3. 3.66 × 8 =
  4. 4.36 × 8 =
  5. 5.16 × 8 =
  6. 6.105 × 4 =
  7. 7.42 × 8 =
  8. 8.54 × 8 =
  9. 9.25 × 4 =
  10. 10.18 × 8 =
  11. 11.39 × 8 =
  12. 12.26 × 8 =
  13. 13.34 × 4 =
  14. 14.26 × 8 =
  15. 15.65 × 8 =
  16. 16.16 × 8 =
  17. 17.44 × 4 =
  18. 18.58 × 8 =
  19. 19.23 × 4 =
  20. 20.60 × 4 =
  21. 21.67 × 8 =
  22. 22.36 × 4 =
  23. 23.17 × 4 =
  24. 24.123 × 4 =
  25. 25.47 × 8 =
  26. 26.64 × 8 =
  27. 27.34 × 8 =
  28. 28.74 × 8 =
  29. 29.139 × 4 =
  30. 30.76 × 4 =
  31. 31.66 × 8 =
  32. 32.35 × 8 =
  33. 33.25 × 8 =
  34. 34.115 × 4 =
  35. 35.69 × 8 =
  36. 36.32 × 8 =
  37. 37.40 × 4 =
  38. 38.49 × 4 =
  39. 39.28 × 8 =
  40. 40.24 × 8 =

Answer key

  1. 404
  2. 72
  3. 528
  4. 288
  5. 128
  6. 420
  7. 336
  8. 432
  9. 100
  10. 144
  11. 312
  12. 208
  13. 136
  14. 208
  15. 520
  16. 128
  17. 176
  18. 464
  19. 92
  20. 240
  21. 536
  22. 144
  23. 68
  24. 492
  25. 376
  26. 512
  27. 272
  28. 592
  29. 556
  30. 304
  31. 528
  32. 280
  33. 200
  34. 460
  35. 552
  36. 256
  37. 160
  38. 196
  39. 224
  40. 192

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