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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 706 · 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. 1.45 × 4 =
  2. 2.122 × 4 =
  3. 3.32 × 8 =
  4. 4.98 × 4 =
  5. 5.44 × 8 =
  6. 6.82 × 4 =
  7. 7.137 × 4 =
  8. 8.71 × 8 =
  9. 9.16 × 4 =
  10. 10.36 × 4 =
  11. 11.54 × 4 =
  12. 12.121 × 4 =
  13. 13.136 × 4 =
  14. 14.56 × 4 =
  15. 15.63 × 8 =
  16. 16.57 × 4 =
  17. 17.74 × 8 =
  18. 18.46 × 8 =
  19. 19.33 × 8 =
  20. 20.21 × 4 =
  21. 21.115 × 4 =
  22. 22.159 × 4 =
  23. 23.19 × 8 =
  24. 24.40 × 4 =
  25. 25.160 × 4 =
  26. 26.72 × 8 =
  27. 27.104 × 4 =
  28. 28.130 × 4 =
  29. 29.14 × 8 =
  30. 30.13 × 8 =
  31. 31.61 × 4 =
  32. 32.159 × 4 =
  33. 33.104 × 4 =
  34. 34.21 × 8 =
  35. 35.59 × 4 =
  36. 36.40 × 4 =
  37. 37.25 × 8 =
  38. 38.51 × 8 =
  39. 39.70 × 4 =
  40. 40.71 × 8 =

Answer key

  1. 180
  2. 488
  3. 256
  4. 392
  5. 352
  6. 328
  7. 548
  8. 568
  9. 64
  10. 144
  11. 216
  12. 484
  13. 544
  14. 224
  15. 504
  16. 228
  17. 592
  18. 368
  19. 264
  20. 84
  21. 460
  22. 636
  23. 152
  24. 160
  25. 640
  26. 576
  27. 416
  28. 520
  29. 112
  30. 104
  31. 244
  32. 636
  33. 416
  34. 168
  35. 236
  36. 160
  37. 200
  38. 408
  39. 280
  40. 568

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