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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 taken6,532
Average score50.0%
Rating5.00
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 Number 
Double
367
734
76
152
759
1518
857
1714
 Number 
Double
878
1756
153
306
70
140
373
746
 Number 
Double
642
1284
11
22
825
1650
819
1638
 Number 
Double
730
1460
590
1180
483
966
480
960
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