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 taken6,399
Average score50.0%
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 Number 
Double
172
344
450
900
912
1824
991
1982
779
1558
966
1932
241
482
74
148
885
1770
459
918
947
1894
656
1312
342
684
185
370
939
1878
442
884
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