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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 47 · 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. 1.63 × 4 =
  2. 2.27 × 4 =
  3. 3.48 × 4 =
  4. 4.30 × 8 =
  5. 5.69 × 8 =
  6. 6.38 × 4 =
  7. 7.144 × 4 =
  8. 8.17 × 8 =
  9. 9.35 × 4 =
  10. 10.45 × 8 =
  11. 11.155 × 4 =
  12. 12.146 × 4 =
  13. 13.13 × 4 =
  14. 14.23 × 8 =
  15. 15.71 × 4 =
  16. 16.122 × 4 =
  17. 17.35 × 4 =
  18. 18.72 × 4 =
  19. 19.37 × 4 =
  20. 20.93 × 4 =
  21. 21.20 × 8 =
  22. 22.133 × 4 =
  23. 23.28 × 8 =
  24. 24.126 × 4 =
  25. 25.47 × 4 =
  26. 26.40 × 4 =
  27. 27.20 × 8 =
  28. 28.48 × 8 =
  29. 29.13 × 8 =
  30. 30.155 × 4 =
  31. 31.17 × 4 =
  32. 32.20 × 4 =
  33. 33.35 × 8 =
  34. 34.65 × 8 =
  35. 35.28 × 4 =
  36. 36.45 × 8 =
  37. 37.61 × 4 =
  38. 38.14 × 8 =
  39. 39.31 × 8 =
  40. 40.147 × 4 =

Answer key

  1. 252
  2. 108
  3. 192
  4. 240
  5. 552
  6. 152
  7. 576
  8. 136
  9. 140
  10. 360
  11. 620
  12. 584
  13. 52
  14. 184
  15. 284
  16. 488
  17. 140
  18. 288
  19. 148
  20. 372
  21. 160
  22. 532
  23. 224
  24. 504
  25. 188
  26. 160
  27. 160
  28. 384
  29. 104
  30. 620
  31. 68
  32. 80
  33. 280
  34. 520
  35. 112
  36. 360
  37. 244
  38. 112
  39. 248
  40. 588

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