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Fast Math - Double That Number! in 30 Seconds

In just 30 seconds, can you double all of these numbers?
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Quiz by Stewart
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Last updated: November 27, 2019
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First submittedApril 17, 2018
Times taken6,974
Average score43.8%
Rating5.00
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 Number 
Double
879
1758
236
472
964
1928
575
1150
 Number 
Double
891
1782
413
826
447
894
260
520
 Number 
Double
335
670
584
1168
500
1000
205
410
 Number 
Double
218
436
238
476
362
724
871
1742
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