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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 449 · 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. 1.23 × 8 =
  2. 2.37 × 4 =
  3. 3.81 × 4 =
  4. 4.19 × 8 =
  5. 5.20 × 8 =
  6. 6.30 × 4 =
  7. 7.126 × 4 =
  8. 8.36 × 8 =
  9. 9.88 × 4 =
  10. 10.19 × 8 =
  11. 11.16 × 4 =
  12. 12.108 × 4 =
  13. 13.79 × 4 =
  14. 14.43 × 4 =
  15. 15.63 × 8 =
  16. 16.75 × 4 =
  17. 17.18 × 4 =
  18. 18.42 × 8 =
  19. 19.14 × 8 =
  20. 20.62 × 8 =
  21. 21.155 × 4 =
  22. 22.143 × 4 =
  23. 23.65 × 4 =
  24. 24.108 × 4 =
  25. 25.147 × 4 =
  26. 26.53 × 8 =
  27. 27.128 × 4 =
  28. 28.36 × 8 =
  29. 29.73 × 8 =
  30. 30.29 × 8 =
  31. 31.59 × 8 =
  32. 32.56 × 4 =
  33. 33.82 × 4 =
  34. 34.25 × 8 =
  35. 35.94 × 4 =
  36. 36.13 × 4 =
  37. 37.44 × 4 =
  38. 38.114 × 4 =
  39. 39.41 × 8 =
  40. 40.55 × 4 =

Answer key

  1. 184
  2. 148
  3. 324
  4. 152
  5. 160
  6. 120
  7. 504
  8. 288
  9. 352
  10. 152
  11. 64
  12. 432
  13. 316
  14. 172
  15. 504
  16. 300
  17. 72
  18. 336
  19. 112
  20. 496
  21. 620
  22. 572
  23. 260
  24. 432
  25. 588
  26. 424
  27. 512
  28. 288
  29. 584
  30. 232
  31. 472
  32. 224
  33. 328
  34. 200
  35. 376
  36. 52
  37. 176
  38. 456
  39. 328
  40. 220

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