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 taken6,681
Average score43.8%
Rating5.00
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 Number 
Double
210
420
297
594
884
1768
659
1318
655
1310
609
1218
576
1152
431
862
962
1924
27
54
127
254
685
1370
410
820
224
448
615
1230
280
560
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