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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 taken6,900
Average score43.8%
Rating5.00
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 Number 
Double
553
1106
223
446
557
1114
306
612
 Number 
Double
501
1002
388
776
992
1984
495
990
 Number 
Double
536
1072
14
28
38
76
850
1700
 Number 
Double
206
412
726
1452
397
794
965
1930
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