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Timed Test For
Quickly Subtracting Multiples of 10
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Practice this topic instead
Sample Problem
** $\huge\blueD{50} - \greenD{20} = {?}$ ** [[☃ input-number 1]]
What's your name?
Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
