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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 729 · 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. 1.57 × 8 =
  2. 2.83 × 4 =
  3. 3.99 × 4 =
  4. 4.70 × 4 =
  5. 5.102 × 4 =
  6. 6.100 × 4 =
  7. 7.85 × 4 =
  8. 8.159 × 4 =
  9. 9.41 × 8 =
  10. 10.35 × 4 =
  11. 11.68 × 4 =
  12. 12.36 × 4 =
  13. 13.23 × 8 =
  14. 14.28 × 8 =
  15. 15.13 × 4 =
  16. 16.19 × 8 =
  17. 17.22 × 8 =
  18. 18.148 × 4 =
  19. 19.89 × 4 =
  20. 20.21 × 4 =
  21. 21.64 × 4 =
  22. 22.38 × 8 =
  23. 23.29 × 8 =
  24. 24.13 × 4 =
  25. 25.159 × 4 =
  26. 26.52 × 8 =
  27. 27.51 × 4 =
  28. 28.143 × 4 =
  29. 29.22 × 4 =
  30. 30.38 × 8 =
  31. 31.75 × 4 =
  32. 32.104 × 4 =
  33. 33.18 × 8 =
  34. 34.145 × 4 =
  35. 35.122 × 4 =
  36. 36.20 × 4 =
  37. 37.59 × 8 =
  38. 38.118 × 4 =
  39. 39.82 × 4 =
  40. 40.19 × 4 =

Answer key

  1. 456
  2. 332
  3. 396
  4. 280
  5. 408
  6. 400
  7. 340
  8. 636
  9. 328
  10. 140
  11. 272
  12. 144
  13. 184
  14. 224
  15. 52
  16. 152
  17. 176
  18. 592
  19. 356
  20. 84
  21. 256
  22. 304
  23. 232
  24. 52
  25. 636
  26. 416
  27. 204
  28. 572
  29. 88
  30. 304
  31. 300
  32. 416
  33. 144
  34. 580
  35. 488
  36. 80
  37. 472
  38. 472
  39. 328
  40. 76

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