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Timed Test For
Visually add and subtract fractions
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Sample Problem
**Subtract.** $\dfrac{5}{9} - \dfrac{1}{3} = $ [[☃ numeric-input 1]] 
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Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
