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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 101 · 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. 1.160 × 4 =
  2. 2.62 × 8 =
  3. 3.37 × 4 =
  4. 4.15 × 4 =
  5. 5.126 × 4 =
  6. 6.106 × 4 =
  7. 7.17 × 4 =
  8. 8.30 × 8 =
  9. 9.12 × 8 =
  10. 10.66 × 4 =
  11. 11.64 × 8 =
  12. 12.33 × 8 =
  13. 13.131 × 4 =
  14. 14.67 × 4 =
  15. 15.62 × 4 =
  16. 16.99 × 4 =
  17. 17.103 × 4 =
  18. 18.45 × 4 =
  19. 19.66 × 8 =
  20. 20.55 × 4 =
  21. 21.59 × 4 =
  22. 22.26 × 4 =
  23. 23.143 × 4 =
  24. 24.98 × 4 =
  25. 25.72 × 8 =
  26. 26.116 × 4 =
  27. 27.36 × 8 =
  28. 28.14 × 8 =
  29. 29.18 × 4 =
  30. 30.17 × 8 =
  31. 31.26 × 4 =
  32. 32.60 × 4 =
  33. 33.27 × 8 =
  34. 34.112 × 4 =
  35. 35.134 × 4 =
  36. 36.159 × 4 =
  37. 37.91 × 4 =
  38. 38.31 × 8 =
  39. 39.91 × 4 =
  40. 40.20 × 4 =

Answer key

  1. 640
  2. 496
  3. 148
  4. 60
  5. 504
  6. 424
  7. 68
  8. 240
  9. 96
  10. 264
  11. 512
  12. 264
  13. 524
  14. 268
  15. 248
  16. 396
  17. 412
  18. 180
  19. 528
  20. 220
  21. 236
  22. 104
  23. 572
  24. 392
  25. 576
  26. 464
  27. 288
  28. 112
  29. 72
  30. 136
  31. 104
  32. 240
  33. 216
  34. 448
  35. 536
  36. 636
  37. 364
  38. 248
  39. 364
  40. 80

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