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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 741 · 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. 1.28 × 8 =
  2. 2.50 × 8 =
  3. 3.58 × 8 =
  4. 4.20 × 8 =
  5. 5.21 × 4 =
  6. 6.45 × 4 =
  7. 7.45 × 8 =
  8. 8.28 × 8 =
  9. 9.27 × 8 =
  10. 10.87 × 4 =
  11. 11.75 × 8 =
  12. 12.44 × 8 =
  13. 13.65 × 4 =
  14. 14.116 × 4 =
  15. 15.44 × 8 =
  16. 16.42 × 4 =
  17. 17.43 × 8 =
  18. 18.18 × 8 =
  19. 19.31 × 4 =
  20. 20.78 × 4 =
  21. 21.129 × 4 =
  22. 22.60 × 8 =
  23. 23.100 × 4 =
  24. 24.52 × 4 =
  25. 25.52 × 4 =
  26. 26.59 × 8 =
  27. 27.24 × 4 =
  28. 28.25 × 8 =
  29. 29.155 × 4 =
  30. 30.27 × 8 =
  31. 31.62 × 8 =
  32. 32.95 × 4 =
  33. 33.42 × 4 =
  34. 34.72 × 8 =
  35. 35.132 × 4 =
  36. 36.25 × 4 =
  37. 37.120 × 4 =
  38. 38.30 × 4 =
  39. 39.27 × 4 =
  40. 40.19 × 8 =

Answer key

  1. 224
  2. 400
  3. 464
  4. 160
  5. 84
  6. 180
  7. 360
  8. 224
  9. 216
  10. 348
  11. 600
  12. 352
  13. 260
  14. 464
  15. 352
  16. 168
  17. 344
  18. 144
  19. 124
  20. 312
  21. 516
  22. 480
  23. 400
  24. 208
  25. 208
  26. 472
  27. 96
  28. 200
  29. 620
  30. 216
  31. 496
  32. 380
  33. 168
  34. 576
  35. 528
  36. 100
  37. 480
  38. 120
  39. 108
  40. 152

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