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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 808 · 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. 1.75 × 4 =
  2. 2.83 × 4 =
  3. 3.109 × 4 =
  4. 4.67 × 8 =
  5. 5.90 × 4 =
  6. 6.142 × 4 =
  7. 7.21 × 8 =
  8. 8.52 × 8 =
  9. 9.14 × 4 =
  10. 10.46 × 8 =
  11. 11.66 × 8 =
  12. 12.29 × 4 =
  13. 13.65 × 8 =
  14. 14.150 × 4 =
  15. 15.149 × 4 =
  16. 16.25 × 8 =
  17. 17.65 × 4 =
  18. 18.30 × 8 =
  19. 19.142 × 4 =
  20. 20.48 × 8 =
  21. 21.31 × 8 =
  22. 22.38 × 4 =
  23. 23.44 × 4 =
  24. 24.27 × 8 =
  25. 25.45 × 8 =
  26. 26.46 × 8 =
  27. 27.47 × 8 =
  28. 28.113 × 4 =
  29. 29.34 × 8 =
  30. 30.158 × 4 =
  31. 31.153 × 4 =
  32. 32.96 × 4 =
  33. 33.64 × 4 =
  34. 34.65 × 8 =
  35. 35.127 × 4 =
  36. 36.15 × 8 =
  37. 37.111 × 4 =
  38. 38.47 × 4 =
  39. 39.88 × 4 =
  40. 40.50 × 4 =

Answer key

  1. 300
  2. 332
  3. 436
  4. 536
  5. 360
  6. 568
  7. 168
  8. 416
  9. 56
  10. 368
  11. 528
  12. 116
  13. 520
  14. 600
  15. 596
  16. 200
  17. 260
  18. 240
  19. 568
  20. 384
  21. 248
  22. 152
  23. 176
  24. 216
  25. 360
  26. 368
  27. 376
  28. 452
  29. 272
  30. 632
  31. 612
  32. 384
  33. 256
  34. 520
  35. 508
  36. 120
  37. 444
  38. 188
  39. 352
  40. 200

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