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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 514 · 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. 1.100 × 4 =
  2. 2.156 × 4 =
  3. 3.130 × 4 =
  4. 4.16 × 8 =
  5. 5.47 × 8 =
  6. 6.21 × 4 =
  7. 7.101 × 4 =
  8. 8.60 × 8 =
  9. 9.28 × 8 =
  10. 10.41 × 4 =
  11. 11.14 × 4 =
  12. 12.40 × 4 =
  13. 13.37 × 4 =
  14. 14.34 × 4 =
  15. 15.30 × 4 =
  16. 16.158 × 4 =
  17. 17.25 × 8 =
  18. 18.56 × 4 =
  19. 19.103 × 4 =
  20. 20.27 × 8 =
  21. 21.100 × 4 =
  22. 22.130 × 4 =
  23. 23.134 × 4 =
  24. 24.75 × 8 =
  25. 25.158 × 4 =
  26. 26.83 × 4 =
  27. 27.17 × 4 =
  28. 28.13 × 4 =
  29. 29.19 × 8 =
  30. 30.26 × 8 =
  31. 31.28 × 8 =
  32. 32.37 × 8 =
  33. 33.69 × 8 =
  34. 34.141 × 4 =
  35. 35.30 × 8 =
  36. 36.27 × 8 =
  37. 37.44 × 8 =
  38. 38.99 × 4 =
  39. 39.16 × 8 =
  40. 40.52 × 4 =

Answer key

  1. 400
  2. 624
  3. 520
  4. 128
  5. 376
  6. 84
  7. 404
  8. 480
  9. 224
  10. 164
  11. 56
  12. 160
  13. 148
  14. 136
  15. 120
  16. 632
  17. 200
  18. 224
  19. 412
  20. 216
  21. 400
  22. 520
  23. 536
  24. 600
  25. 632
  26. 332
  27. 68
  28. 52
  29. 152
  30. 208
  31. 224
  32. 296
  33. 552
  34. 564
  35. 240
  36. 216
  37. 352
  38. 396
  39. 128
  40. 208

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