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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 763 · 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. 1.27 × 8 =
  2. 2.139 × 4 =
  3. 3.17 × 8 =
  4. 4.156 × 4 =
  5. 5.85 × 4 =
  6. 6.55 × 8 =
  7. 7.67 × 8 =
  8. 8.19 × 8 =
  9. 9.50 × 8 =
  10. 10.24 × 8 =
  11. 11.21 × 4 =
  12. 12.84 × 4 =
  13. 13.72 × 4 =
  14. 14.146 × 4 =
  15. 15.28 × 4 =
  16. 16.16 × 8 =
  17. 17.32 × 4 =
  18. 18.50 × 4 =
  19. 19.64 × 4 =
  20. 20.125 × 4 =
  21. 21.46 × 4 =
  22. 22.17 × 8 =
  23. 23.36 × 8 =
  24. 24.39 × 8 =
  25. 25.150 × 4 =
  26. 26.105 × 4 =
  27. 27.67 × 8 =
  28. 28.125 × 4 =
  29. 29.18 × 8 =
  30. 30.25 × 4 =
  31. 31.57 × 4 =
  32. 32.53 × 4 =
  33. 33.28 × 4 =
  34. 34.24 × 8 =
  35. 35.52 × 4 =
  36. 36.54 × 8 =
  37. 37.15 × 4 =
  38. 38.43 × 8 =
  39. 39.19 × 4 =
  40. 40.92 × 4 =

Answer key

  1. 216
  2. 556
  3. 136
  4. 624
  5. 340
  6. 440
  7. 536
  8. 152
  9. 400
  10. 192
  11. 84
  12. 336
  13. 288
  14. 584
  15. 112
  16. 128
  17. 128
  18. 200
  19. 256
  20. 500
  21. 184
  22. 136
  23. 288
  24. 312
  25. 600
  26. 420
  27. 536
  28. 500
  29. 144
  30. 100
  31. 228
  32. 212
  33. 112
  34. 192
  35. 208
  36. 432
  37. 60
  38. 344
  39. 76
  40. 368

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