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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 386 · 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. 1.125 × 4 =
  2. 2.54 × 4 =
  3. 3.14 × 8 =
  4. 4.128 × 4 =
  5. 5.64 × 4 =
  6. 6.33 × 8 =
  7. 7.23 × 8 =
  8. 8.33 × 8 =
  9. 9.36 × 8 =
  10. 10.72 × 8 =
  11. 11.66 × 8 =
  12. 12.56 × 4 =
  13. 13.68 × 8 =
  14. 14.126 × 4 =
  15. 15.52 × 8 =
  16. 16.69 × 4 =
  17. 17.42 × 8 =
  18. 18.154 × 4 =
  19. 19.29 × 8 =
  20. 20.21 × 8 =
  21. 21.63 × 4 =
  22. 22.13 × 8 =
  23. 23.145 × 4 =
  24. 24.77 × 4 =
  25. 25.55 × 4 =
  26. 26.36 × 8 =
  27. 27.120 × 4 =
  28. 28.76 × 4 =
  29. 29.25 × 8 =
  30. 30.128 × 4 =
  31. 31.108 × 4 =
  32. 32.63 × 4 =
  33. 33.58 × 8 =
  34. 34.13 × 4 =
  35. 35.69 × 8 =
  36. 36.78 × 4 =
  37. 37.57 × 4 =
  38. 38.39 × 8 =
  39. 39.50 × 8 =
  40. 40.26 × 8 =

Answer key

  1. 500
  2. 216
  3. 112
  4. 512
  5. 256
  6. 264
  7. 184
  8. 264
  9. 288
  10. 576
  11. 528
  12. 224
  13. 544
  14. 504
  15. 416
  16. 276
  17. 336
  18. 616
  19. 232
  20. 168
  21. 252
  22. 104
  23. 580
  24. 308
  25. 220
  26. 288
  27. 480
  28. 304
  29. 200
  30. 512
  31. 432
  32. 252
  33. 464
  34. 52
  35. 552
  36. 312
  37. 228
  38. 312
  39. 400
  40. 208

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