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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 880 · 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. 1.37 × 4 =
  2. 2.20 × 4 =
  3. 3.43 × 4 =
  4. 4.58 × 4 =
  5. 5.37 × 8 =
  6. 6.100 × 4 =
  7. 7.32 × 8 =
  8. 8.50 × 4 =
  9. 9.12 × 8 =
  10. 10.43 × 4 =
  11. 11.32 × 8 =
  12. 12.51 × 4 =
  13. 13.70 × 8 =
  14. 14.69 × 4 =
  15. 15.158 × 4 =
  16. 16.55 × 8 =
  17. 17.48 × 8 =
  18. 18.105 × 4 =
  19. 19.22 × 8 =
  20. 20.28 × 8 =
  21. 21.71 × 8 =
  22. 22.17 × 4 =
  23. 23.24 × 8 =
  24. 24.38 × 8 =
  25. 25.45 × 8 =
  26. 26.31 × 4 =
  27. 27.150 × 4 =
  28. 28.57 × 4 =
  29. 29.26 × 4 =
  30. 30.153 × 4 =
  31. 31.71 × 8 =
  32. 32.31 × 8 =
  33. 33.68 × 8 =
  34. 34.20 × 8 =
  35. 35.137 × 4 =
  36. 36.90 × 4 =
  37. 37.75 × 8 =
  38. 38.44 × 8 =
  39. 39.34 × 4 =
  40. 40.43 × 8 =

Answer key

  1. 148
  2. 80
  3. 172
  4. 232
  5. 296
  6. 400
  7. 256
  8. 200
  9. 96
  10. 172
  11. 256
  12. 204
  13. 560
  14. 276
  15. 632
  16. 440
  17. 384
  18. 420
  19. 176
  20. 224
  21. 568
  22. 68
  23. 192
  24. 304
  25. 360
  26. 124
  27. 600
  28. 228
  29. 104
  30. 612
  31. 568
  32. 248
  33. 544
  34. 160
  35. 548
  36. 360
  37. 600
  38. 352
  39. 136
  40. 344

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