Examine how Theresa solved the following subtraction problem 2049 - 278. $\begin{array}{c} \stackrel{1}{2} \stackrel{10}{0} \stackrel{14}{4} \stackrel{9}{9} \ \underline{- \quad 278} \ \ 871 \end{array}$ Is Theresa correct? Explain mathematically why or why not. Use base-ten blocks to support your answer.
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Step 1: Theresa correctly lined up the numbers in the subtraction problem. Show more…
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