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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 647 · 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. 1.22 × 8 =
  2. 2.48 × 4 =
  3. 3.41 × 4 =
  4. 4.152 × 4 =
  5. 5.25 × 8 =
  6. 6.37 × 8 =
  7. 7.58 × 8 =
  8. 8.67 × 8 =
  9. 9.28 × 8 =
  10. 10.21 × 8 =
  11. 11.56 × 4 =
  12. 12.76 × 4 =
  13. 13.52 × 4 =
  14. 14.35 × 8 =
  15. 15.123 × 4 =
  16. 16.71 × 4 =
  17. 17.34 × 4 =
  18. 18.17 × 8 =
  19. 19.73 × 8 =
  20. 20.31 × 4 =
  21. 21.60 × 4 =
  22. 22.55 × 4 =
  23. 23.108 × 4 =
  24. 24.105 × 4 =
  25. 25.58 × 8 =
  26. 26.59 × 8 =
  27. 27.41 × 4 =
  28. 28.101 × 4 =
  29. 29.25 × 8 =
  30. 30.43 × 4 =
  31. 31.18 × 8 =
  32. 32.122 × 4 =
  33. 33.114 × 4 =
  34. 34.21 × 8 =
  35. 35.54 × 4 =
  36. 36.51 × 4 =
  37. 37.61 × 4 =
  38. 38.34 × 4 =
  39. 39.126 × 4 =
  40. 40.113 × 4 =

Answer key

  1. 176
  2. 192
  3. 164
  4. 608
  5. 200
  6. 296
  7. 464
  8. 536
  9. 224
  10. 168
  11. 224
  12. 304
  13. 208
  14. 280
  15. 492
  16. 284
  17. 136
  18. 136
  19. 584
  20. 124
  21. 240
  22. 220
  23. 432
  24. 420
  25. 464
  26. 472
  27. 164
  28. 404
  29. 200
  30. 172
  31. 144
  32. 488
  33. 456
  34. 168
  35. 216
  36. 204
  37. 244
  38. 136
  39. 504
  40. 452

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