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Multiply by 4 and 8 Worksheet

Speed calculation lesson 6: Doubling sprints: × 4 and × 8 · Set 990 · 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. 1.146 × 4 =
  2. 2.125 × 4 =
  3. 3.58 × 4 =
  4. 4.56 × 8 =
  5. 5.143 × 4 =
  6. 6.34 × 4 =
  7. 7.63 × 8 =
  8. 8.65 × 8 =
  9. 9.26 × 4 =
  10. 10.35 × 8 =
  11. 11.77 × 4 =
  12. 12.42 × 8 =
  13. 13.63 × 8 =
  14. 14.72 × 8 =
  15. 15.35 × 4 =
  16. 16.136 × 4 =
  17. 17.13 × 8 =
  18. 18.50 × 8 =
  19. 19.40 × 8 =
  20. 20.32 × 8 =
  21. 21.71 × 4 =
  22. 22.13 × 4 =
  23. 23.18 × 8 =
  24. 24.116 × 4 =
  25. 25.93 × 4 =
  26. 26.107 × 4 =
  27. 27.37 × 4 =
  28. 28.84 × 4 =
  29. 29.15 × 8 =
  30. 30.30 × 8 =
  31. 31.19 × 8 =
  32. 32.15 × 8 =
  33. 33.100 × 4 =
  34. 34.27 × 8 =
  35. 35.58 × 8 =
  36. 36.19 × 4 =
  37. 37.38 × 8 =
  38. 38.34 × 4 =
  39. 39.28 × 4 =
  40. 40.15 × 8 =

Answer key

  1. 584
  2. 500
  3. 232
  4. 448
  5. 572
  6. 136
  7. 504
  8. 520
  9. 104
  10. 280
  11. 308
  12. 336
  13. 504
  14. 576
  15. 140
  16. 544
  17. 104
  18. 400
  19. 320
  20. 256
  21. 284
  22. 52
  23. 144
  24. 464
  25. 372
  26. 428
  27. 148
  28. 336
  29. 120
  30. 240
  31. 152
  32. 120
  33. 400
  34. 216
  35. 464
  36. 76
  37. 304
  38. 136
  39. 112
  40. 120

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