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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 taken6,589
Average score50.0%
Rating5.00
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 Number 
Double
963
1926
537
1074
883
1766
112
224
 Number 
Double
734
1468
839
1678
579
1158
921
1842
 Number 
Double
239
478
543
1086
93
186
632
1264
 Number 
Double
862
1724
882
1764
522
1044
846
1692
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