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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 81 · 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. 1.56 × 4 =
  2. 2.82 × 4 =
  3. 3.45 × 8 =
  4. 4.16 × 4 =
  5. 5.40 × 4 =
  6. 6.49 × 8 =
  7. 7.118 × 4 =
  8. 8.30 × 8 =
  9. 9.51 × 8 =
  10. 10.19 × 8 =
  11. 11.64 × 8 =
  12. 12.20 × 8 =
  13. 13.63 × 8 =
  14. 14.50 × 4 =
  15. 15.95 × 4 =
  16. 16.152 × 4 =
  17. 17.55 × 8 =
  18. 18.15 × 8 =
  19. 19.31 × 4 =
  20. 20.37 × 4 =
  21. 21.32 × 8 =
  22. 22.74 × 8 =
  23. 23.59 × 4 =
  24. 24.143 × 4 =
  25. 25.74 × 8 =
  26. 26.22 × 8 =
  27. 27.131 × 4 =
  28. 28.49 × 8 =
  29. 29.72 × 4 =
  30. 30.126 × 4 =
  31. 31.115 × 4 =
  32. 32.100 × 4 =
  33. 33.70 × 4 =
  34. 34.17 × 4 =
  35. 35.65 × 8 =
  36. 36.66 × 8 =
  37. 37.105 × 4 =
  38. 38.75 × 4 =
  39. 39.99 × 4 =
  40. 40.25 × 8 =

Answer key

  1. 224
  2. 328
  3. 360
  4. 64
  5. 160
  6. 392
  7. 472
  8. 240
  9. 408
  10. 152
  11. 512
  12. 160
  13. 504
  14. 200
  15. 380
  16. 608
  17. 440
  18. 120
  19. 124
  20. 148
  21. 256
  22. 592
  23. 236
  24. 572
  25. 592
  26. 176
  27. 524
  28. 392
  29. 288
  30. 504
  31. 460
  32. 400
  33. 280
  34. 68
  35. 520
  36. 528
  37. 420
  38. 300
  39. 396
  40. 200

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