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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 70 · 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. 1.17 × 4 =
  2. 2.107 × 4 =
  3. 3.23 × 4 =
  4. 4.114 × 4 =
  5. 5.148 × 4 =
  6. 6.49 × 8 =
  7. 7.100 × 4 =
  8. 8.62 × 8 =
  9. 9.111 × 4 =
  10. 10.80 × 4 =
  11. 11.28 × 4 =
  12. 12.63 × 8 =
  13. 13.17 × 4 =
  14. 14.22 × 8 =
  15. 15.20 × 8 =
  16. 16.148 × 4 =
  17. 17.140 × 4 =
  18. 18.77 × 4 =
  19. 19.17 × 8 =
  20. 20.78 × 4 =
  21. 21.57 × 4 =
  22. 22.41 × 8 =
  23. 23.43 × 8 =
  24. 24.106 × 4 =
  25. 25.72 × 8 =
  26. 26.49 × 4 =
  27. 27.52 × 8 =
  28. 28.47 × 8 =
  29. 29.51 × 8 =
  30. 30.20 × 4 =
  31. 31.50 × 4 =
  32. 32.61 × 8 =
  33. 33.70 × 4 =
  34. 34.39 × 8 =
  35. 35.20 × 4 =
  36. 36.70 × 8 =
  37. 37.87 × 4 =
  38. 38.108 × 4 =
  39. 39.146 × 4 =
  40. 40.110 × 4 =

Answer key

  1. 68
  2. 428
  3. 92
  4. 456
  5. 592
  6. 392
  7. 400
  8. 496
  9. 444
  10. 320
  11. 112
  12. 504
  13. 68
  14. 176
  15. 160
  16. 592
  17. 560
  18. 308
  19. 136
  20. 312
  21. 228
  22. 328
  23. 344
  24. 424
  25. 576
  26. 196
  27. 416
  28. 376
  29. 408
  30. 80
  31. 200
  32. 488
  33. 280
  34. 312
  35. 80
  36. 560
  37. 348
  38. 432
  39. 584
  40. 440

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