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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 5 · 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. 1.27 × 4 =
  2. 2.46 × 8 =
  3. 3.131 × 4 =
  4. 4.36 × 4 =
  5. 5.74 × 8 =
  6. 6.135 × 4 =
  7. 7.24 × 8 =
  8. 8.44 × 8 =
  9. 9.15 × 8 =
  10. 10.92 × 4 =
  11. 11.41 × 4 =
  12. 12.28 × 8 =
  13. 13.150 × 4 =
  14. 14.29 × 4 =
  15. 15.27 × 8 =
  16. 16.123 × 4 =
  17. 17.36 × 8 =
  18. 18.27 × 4 =
  19. 19.14 × 8 =
  20. 20.100 × 4 =
  21. 21.120 × 4 =
  22. 22.117 × 4 =
  23. 23.29 × 4 =
  24. 24.63 × 8 =
  25. 25.50 × 4 =
  26. 26.58 × 8 =
  27. 27.115 × 4 =
  28. 28.125 × 4 =
  29. 29.19 × 4 =
  30. 30.21 × 4 =
  31. 31.83 × 4 =
  32. 32.47 × 4 =
  33. 33.46 × 8 =
  34. 34.18 × 8 =
  35. 35.68 × 8 =
  36. 36.32 × 4 =
  37. 37.63 × 8 =
  38. 38.87 × 4 =
  39. 39.100 × 4 =
  40. 40.59 × 8 =

Answer key

  1. 108
  2. 368
  3. 524
  4. 144
  5. 592
  6. 540
  7. 192
  8. 352
  9. 120
  10. 368
  11. 164
  12. 224
  13. 600
  14. 116
  15. 216
  16. 492
  17. 288
  18. 108
  19. 112
  20. 400
  21. 480
  22. 468
  23. 116
  24. 504
  25. 200
  26. 464
  27. 460
  28. 500
  29. 76
  30. 84
  31. 332
  32. 188
  33. 368
  34. 144
  35. 544
  36. 128
  37. 504
  38. 348
  39. 400
  40. 472

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