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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 145 · 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. 1.16 × 8 =
  2. 2.30 × 8 =
  3. 3.37 × 8 =
  4. 4.25 × 8 =
  5. 5.25 × 8 =
  6. 6.17 × 4 =
  7. 7.34 × 4 =
  8. 8.14 × 8 =
  9. 9.53 × 8 =
  10. 10.119 × 4 =
  11. 11.49 × 8 =
  12. 12.28 × 4 =
  13. 13.33 × 8 =
  14. 14.114 × 4 =
  15. 15.28 × 8 =
  16. 16.18 × 4 =
  17. 17.33 × 8 =
  18. 18.24 × 8 =
  19. 19.151 × 4 =
  20. 20.15 × 4 =
  21. 21.142 × 4 =
  22. 22.112 × 4 =
  23. 23.65 × 4 =
  24. 24.32 × 8 =
  25. 25.88 × 4 =
  26. 26.25 × 8 =
  27. 27.15 × 8 =
  28. 28.86 × 4 =
  29. 29.58 × 8 =
  30. 30.12 × 8 =
  31. 31.46 × 8 =
  32. 32.28 × 8 =
  33. 33.56 × 4 =
  34. 34.73 × 8 =
  35. 35.28 × 8 =
  36. 36.50 × 8 =
  37. 37.16 × 8 =
  38. 38.64 × 8 =
  39. 39.55 × 8 =
  40. 40.13 × 8 =

Answer key

  1. 128
  2. 240
  3. 296
  4. 200
  5. 200
  6. 68
  7. 136
  8. 112
  9. 424
  10. 476
  11. 392
  12. 112
  13. 264
  14. 456
  15. 224
  16. 72
  17. 264
  18. 192
  19. 604
  20. 60
  21. 568
  22. 448
  23. 260
  24. 256
  25. 352
  26. 200
  27. 120
  28. 344
  29. 464
  30. 96
  31. 368
  32. 224
  33. 224
  34. 584
  35. 224
  36. 400
  37. 128
  38. 512
  39. 440
  40. 104

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