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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 238 · 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. 1.64 × 8 =
  2. 2.52 × 4 =
  3. 3.71 × 4 =
  4. 4.59 × 4 =
  5. 5.61 × 8 =
  6. 6.72 × 8 =
  7. 7.52 × 4 =
  8. 8.52 × 8 =
  9. 9.145 × 4 =
  10. 10.62 × 8 =
  11. 11.100 × 4 =
  12. 12.156 × 4 =
  13. 13.64 × 4 =
  14. 14.72 × 8 =
  15. 15.60 × 8 =
  16. 16.42 × 8 =
  17. 17.132 × 4 =
  18. 18.29 × 4 =
  19. 19.35 × 8 =
  20. 20.74 × 4 =
  21. 21.33 × 4 =
  22. 22.32 × 4 =
  23. 23.113 × 4 =
  24. 24.25 × 8 =
  25. 25.136 × 4 =
  26. 26.14 × 8 =
  27. 27.137 × 4 =
  28. 28.21 × 8 =
  29. 29.44 × 4 =
  30. 30.63 × 4 =
  31. 31.52 × 4 =
  32. 32.74 × 8 =
  33. 33.37 × 4 =
  34. 34.119 × 4 =
  35. 35.30 × 8 =
  36. 36.107 × 4 =
  37. 37.81 × 4 =
  38. 38.12 × 8 =
  39. 39.128 × 4 =
  40. 40.15 × 8 =

Answer key

  1. 512
  2. 208
  3. 284
  4. 236
  5. 488
  6. 576
  7. 208
  8. 416
  9. 580
  10. 496
  11. 400
  12. 624
  13. 256
  14. 576
  15. 480
  16. 336
  17. 528
  18. 116
  19. 280
  20. 296
  21. 132
  22. 128
  23. 452
  24. 200
  25. 544
  26. 112
  27. 548
  28. 168
  29. 176
  30. 252
  31. 208
  32. 592
  33. 148
  34. 476
  35. 240
  36. 428
  37. 324
  38. 96
  39. 512
  40. 120

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