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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 581 · 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. 1.84 × 4 =
  2. 2.42 × 8 =
  3. 3.39 × 8 =
  4. 4.14 × 8 =
  5. 5.74 × 8 =
  6. 6.13 × 4 =
  7. 7.26 × 8 =
  8. 8.16 × 8 =
  9. 9.118 × 4 =
  10. 10.84 × 4 =
  11. 11.32 × 8 =
  12. 12.28 × 8 =
  13. 13.68 × 4 =
  14. 14.16 × 4 =
  15. 15.24 × 8 =
  16. 16.132 × 4 =
  17. 17.35 × 4 =
  18. 18.38 × 8 =
  19. 19.118 × 4 =
  20. 20.112 × 4 =
  21. 21.28 × 8 =
  22. 22.26 × 4 =
  23. 23.99 × 4 =
  24. 24.16 × 8 =
  25. 25.16 × 8 =
  26. 26.20 × 8 =
  27. 27.29 × 8 =
  28. 28.45 × 4 =
  29. 29.72 × 4 =
  30. 30.52 × 4 =
  31. 31.67 × 4 =
  32. 32.67 × 4 =
  33. 33.28 × 8 =
  34. 34.48 × 4 =
  35. 35.24 × 8 =
  36. 36.113 × 4 =
  37. 37.29 × 4 =
  38. 38.14 × 8 =
  39. 39.111 × 4 =
  40. 40.35 × 4 =

Answer key

  1. 336
  2. 336
  3. 312
  4. 112
  5. 592
  6. 52
  7. 208
  8. 128
  9. 472
  10. 336
  11. 256
  12. 224
  13. 272
  14. 64
  15. 192
  16. 528
  17. 140
  18. 304
  19. 472
  20. 448
  21. 224
  22. 104
  23. 396
  24. 128
  25. 128
  26. 160
  27. 232
  28. 180
  29. 288
  30. 208
  31. 268
  32. 268
  33. 224
  34. 192
  35. 192
  36. 452
  37. 116
  38. 112
  39. 444
  40. 140

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