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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 18 · 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. 1.39 × 8 =
  2. 2.70 × 4 =
  3. 3.69 × 8 =
  4. 4.123 × 4 =
  5. 5.22 × 4 =
  6. 6.128 × 4 =
  7. 7.53 × 4 =
  8. 8.47 × 8 =
  9. 9.58 × 4 =
  10. 10.22 × 8 =
  11. 11.147 × 4 =
  12. 12.134 × 4 =
  13. 13.158 × 4 =
  14. 14.23 × 8 =
  15. 15.132 × 4 =
  16. 16.71 × 4 =
  17. 17.34 × 4 =
  18. 18.24 × 8 =
  19. 19.47 × 4 =
  20. 20.80 × 4 =
  21. 21.40 × 4 =
  22. 22.69 × 8 =
  23. 23.115 × 4 =
  24. 24.71 × 4 =
  25. 25.52 × 8 =
  26. 26.42 × 8 =
  27. 27.70 × 8 =
  28. 28.52 × 8 =
  29. 29.71 × 8 =
  30. 30.75 × 8 =
  31. 31.143 × 4 =
  32. 32.24 × 8 =
  33. 33.44 × 4 =
  34. 34.37 × 4 =
  35. 35.69 × 8 =
  36. 36.65 × 4 =
  37. 37.18 × 4 =
  38. 38.14 × 8 =
  39. 39.46 × 4 =
  40. 40.52 × 8 =

Answer key

  1. 312
  2. 280
  3. 552
  4. 492
  5. 88
  6. 512
  7. 212
  8. 376
  9. 232
  10. 176
  11. 588
  12. 536
  13. 632
  14. 184
  15. 528
  16. 284
  17. 136
  18. 192
  19. 188
  20. 320
  21. 160
  22. 552
  23. 460
  24. 284
  25. 416
  26. 336
  27. 560
  28. 416
  29. 568
  30. 600
  31. 572
  32. 192
  33. 176
  34. 148
  35. 552
  36. 260
  37. 72
  38. 112
  39. 184
  40. 416

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