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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 taken4,754
Average score43.8%
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 Number 
Double
877
1754
879
1758
794
1588
597
1194
 Number 
Double
71
142
667
1334
517
1034
211
422
 Number 
Double
58
116
932
1864
644
1288
424
848
 Number 
Double
49
98
358
716
286
572
120
240
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