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 taken6,897
Average score43.8%
Rating5.00
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 Number 
Double
900
1800
767
1534
963
1926
34
68
132
264
66
132
970
1940
173
346
813
1626
269
538
578
1156
739
1478
171
342
442
884
626
1252
296
592
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