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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 615 · 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. 1.72 × 8 =
  2. 2.57 × 4 =
  3. 3.41 × 4 =
  4. 4.33 × 4 =
  5. 5.93 × 4 =
  6. 6.31 × 8 =
  7. 7.26 × 8 =
  8. 8.30 × 4 =
  9. 9.50 × 4 =
  10. 10.142 × 4 =
  11. 11.116 × 4 =
  12. 12.73 × 8 =
  13. 13.17 × 4 =
  14. 14.32 × 4 =
  15. 15.30 × 8 =
  16. 16.38 × 8 =
  17. 17.29 × 8 =
  18. 18.61 × 8 =
  19. 19.152 × 4 =
  20. 20.36 × 8 =
  21. 21.109 × 4 =
  22. 22.158 × 4 =
  23. 23.14 × 8 =
  24. 24.135 × 4 =
  25. 25.49 × 4 =
  26. 26.20 × 8 =
  27. 27.141 × 4 =
  28. 28.80 × 4 =
  29. 29.24 × 8 =
  30. 30.50 × 8 =
  31. 31.27 × 8 =
  32. 32.14 × 4 =
  33. 33.64 × 4 =
  34. 34.71 × 8 =
  35. 35.16 × 4 =
  36. 36.114 × 4 =
  37. 37.40 × 4 =
  38. 38.12 × 8 =
  39. 39.47 × 8 =
  40. 40.102 × 4 =

Answer key

  1. 576
  2. 228
  3. 164
  4. 132
  5. 372
  6. 248
  7. 208
  8. 120
  9. 200
  10. 568
  11. 464
  12. 584
  13. 68
  14. 128
  15. 240
  16. 304
  17. 232
  18. 488
  19. 608
  20. 288
  21. 436
  22. 632
  23. 112
  24. 540
  25. 196
  26. 160
  27. 564
  28. 320
  29. 192
  30. 400
  31. 216
  32. 56
  33. 256
  34. 568
  35. 64
  36. 456
  37. 160
  38. 96
  39. 376
  40. 408

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