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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 258 · 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. 1.150 × 4 =
  2. 2.41 × 4 =
  3. 3.50 × 8 =
  4. 4.145 × 4 =
  5. 5.110 × 4 =
  6. 6.68 × 4 =
  7. 7.70 × 8 =
  8. 8.133 × 4 =
  9. 9.14 × 8 =
  10. 10.118 × 4 =
  11. 11.43 × 8 =
  12. 12.70 × 8 =
  13. 13.156 × 4 =
  14. 14.42 × 4 =
  15. 15.45 × 4 =
  16. 16.119 × 4 =
  17. 17.122 × 4 =
  18. 18.48 × 8 =
  19. 19.60 × 8 =
  20. 20.36 × 8 =
  21. 21.36 × 8 =
  22. 22.38 × 8 =
  23. 23.65 × 4 =
  24. 24.65 × 8 =
  25. 25.17 × 8 =
  26. 26.30 × 8 =
  27. 27.50 × 8 =
  28. 28.33 × 4 =
  29. 29.22 × 8 =
  30. 30.36 × 4 =
  31. 31.27 × 4 =
  32. 32.131 × 4 =
  33. 33.124 × 4 =
  34. 34.28 × 8 =
  35. 35.75 × 8 =
  36. 36.48 × 4 =
  37. 37.154 × 4 =
  38. 38.82 × 4 =
  39. 39.108 × 4 =
  40. 40.33 × 4 =

Answer key

  1. 600
  2. 164
  3. 400
  4. 580
  5. 440
  6. 272
  7. 560
  8. 532
  9. 112
  10. 472
  11. 344
  12. 560
  13. 624
  14. 168
  15. 180
  16. 476
  17. 488
  18. 384
  19. 480
  20. 288
  21. 288
  22. 304
  23. 260
  24. 520
  25. 136
  26. 240
  27. 400
  28. 132
  29. 176
  30. 144
  31. 108
  32. 524
  33. 496
  34. 224
  35. 600
  36. 192
  37. 616
  38. 328
  39. 432
  40. 132

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