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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
First submittedApril 17, 2018
Times taken191
0:30
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 Number 
Double
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x
-
x
-
x
-
x
 Number 
Double
-
x
-
x
-
x
-
x
 Number 
Double
-
x
-
x
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x
-
x
 Number 
Double
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x
-
x
-
x
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x
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