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Timed Test For
Subtraction: two digit - two digit (regrouping)
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Sample Problem
$ \begin{array}{r} \huge \phantom{0} 81 \\ \huge - \phantom{0} 19 \\ \hline \end{array} $ [[☃ input-number 1]]
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Duration
30 seconds
60 seconds (1 minute)
120 seconds (2 minutes)
180 seconds (3 minutes)
300 seconds (5 minutes)
