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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 720 · 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. 1.69 × 8 =
  2. 2.124 × 4 =
  3. 3.34 × 4 =
  4. 4.21 × 4 =
  5. 5.57 × 8 =
  6. 6.39 × 8 =
  7. 7.21 × 8 =
  8. 8.59 × 4 =
  9. 9.43 × 8 =
  10. 10.19 × 8 =
  11. 11.30 × 8 =
  12. 12.136 × 4 =
  13. 13.118 × 4 =
  14. 14.16 × 8 =
  15. 15.19 × 4 =
  16. 16.72 × 4 =
  17. 17.73 × 8 =
  18. 18.49 × 4 =
  19. 19.116 × 4 =
  20. 20.129 × 4 =
  21. 21.46 × 8 =
  22. 22.54 × 4 =
  23. 23.18 × 4 =
  24. 24.69 × 8 =
  25. 25.49 × 8 =
  26. 26.17 × 8 =
  27. 27.22 × 8 =
  28. 28.84 × 4 =
  29. 29.61 × 8 =
  30. 30.71 × 4 =
  31. 31.27 × 8 =
  32. 32.155 × 4 =
  33. 33.93 × 4 =
  34. 34.44 × 8 =
  35. 35.35 × 8 =
  36. 36.90 × 4 =
  37. 37.26 × 8 =
  38. 38.44 × 4 =
  39. 39.86 × 4 =
  40. 40.43 × 8 =

Answer key

  1. 552
  2. 496
  3. 136
  4. 84
  5. 456
  6. 312
  7. 168
  8. 236
  9. 344
  10. 152
  11. 240
  12. 544
  13. 472
  14. 128
  15. 76
  16. 288
  17. 584
  18. 196
  19. 464
  20. 516
  21. 368
  22. 216
  23. 72
  24. 552
  25. 392
  26. 136
  27. 176
  28. 336
  29. 488
  30. 284
  31. 216
  32. 620
  33. 372
  34. 352
  35. 280
  36. 360
  37. 208
  38. 176
  39. 344
  40. 344

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