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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 21 · 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. 1.25 × 4 =
  2. 2.31 × 8 =
  3. 3.106 × 4 =
  4. 4.123 × 4 =
  5. 5.56 × 8 =
  6. 6.17 × 8 =
  7. 7.157 × 4 =
  8. 8.41 × 8 =
  9. 9.38 × 8 =
  10. 10.33 × 8 =
  11. 11.30 × 4 =
  12. 12.45 × 8 =
  13. 13.25 × 8 =
  14. 14.34 × 8 =
  15. 15.59 × 8 =
  16. 16.58 × 4 =
  17. 17.27 × 8 =
  18. 18.14 × 8 =
  19. 19.103 × 4 =
  20. 20.55 × 8 =
  21. 21.67 × 4 =
  22. 22.50 × 8 =
  23. 23.57 × 8 =
  24. 24.141 × 4 =
  25. 25.107 × 4 =
  26. 26.58 × 8 =
  27. 27.122 × 4 =
  28. 28.14 × 4 =
  29. 29.18 × 8 =
  30. 30.92 × 4 =
  31. 31.144 × 4 =
  32. 32.21 × 8 =
  33. 33.42 × 4 =
  34. 34.17 × 8 =
  35. 35.127 × 4 =
  36. 36.148 × 4 =
  37. 37.154 × 4 =
  38. 38.25 × 8 =
  39. 39.35 × 4 =
  40. 40.51 × 4 =

Answer key

  1. 100
  2. 248
  3. 424
  4. 492
  5. 448
  6. 136
  7. 628
  8. 328
  9. 304
  10. 264
  11. 120
  12. 360
  13. 200
  14. 272
  15. 472
  16. 232
  17. 216
  18. 112
  19. 412
  20. 440
  21. 268
  22. 400
  23. 456
  24. 564
  25. 428
  26. 464
  27. 488
  28. 56
  29. 144
  30. 368
  31. 576
  32. 168
  33. 168
  34. 136
  35. 508
  36. 592
  37. 616
  38. 200
  39. 140
  40. 204

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