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Timed Test For
Addition: two digits + two digits (regrouping)
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Sample Problem
$ \begin{array}{r} \huge \phantom{0} 52 \\ \huge + \phantom{0} 39 \\ \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)
