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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 999 · 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. 1.40 × 8 =
  2. 2.58 × 4 =
  3. 3.40 × 8 =
  4. 4.153 × 4 =
  5. 5.34 × 8 =
  6. 6.69 × 8 =
  7. 7.13 × 8 =
  8. 8.15 × 8 =
  9. 9.115 × 4 =
  10. 10.37 × 4 =
  11. 11.13 × 4 =
  12. 12.100 × 4 =
  13. 13.32 × 8 =
  14. 14.34 × 4 =
  15. 15.23 × 8 =
  16. 16.28 × 4 =
  17. 17.53 × 4 =
  18. 18.111 × 4 =
  19. 19.26 × 8 =
  20. 20.33 × 8 =
  21. 21.40 × 8 =
  22. 22.13 × 8 =
  23. 23.149 × 4 =
  24. 24.71 × 8 =
  25. 25.33 × 8 =
  26. 26.63 × 8 =
  27. 27.91 × 4 =
  28. 28.51 × 4 =
  29. 29.83 × 4 =
  30. 30.71 × 4 =
  31. 31.72 × 4 =
  32. 32.39 × 8 =
  33. 33.22 × 4 =
  34. 34.123 × 4 =
  35. 35.65 × 4 =
  36. 36.55 × 8 =
  37. 37.52 × 8 =
  38. 38.21 × 8 =
  39. 39.54 × 8 =
  40. 40.61 × 4 =

Answer key

  1. 320
  2. 232
  3. 320
  4. 612
  5. 272
  6. 552
  7. 104
  8. 120
  9. 460
  10. 148
  11. 52
  12. 400
  13. 256
  14. 136
  15. 184
  16. 112
  17. 212
  18. 444
  19. 208
  20. 264
  21. 320
  22. 104
  23. 596
  24. 568
  25. 264
  26. 504
  27. 364
  28. 204
  29. 332
  30. 284
  31. 288
  32. 312
  33. 88
  34. 492
  35. 260
  36. 440
  37. 416
  38. 168
  39. 432
  40. 244

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