16. Hector computed his addition problems by placing the partial sums as shown here: 768 + 647 15 10 13 1415 Use this method to work the following addition problems. 987 a. + 356 415 b. + 79
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For the first problem, we have: $$ \begin{array}{c@{}c@{\;}c@{}c@{}c@{}c} & & & 9 & 8 & 7 \\ & & + & 3 & 5 & 6 \\ \cline{2-6} & & 1 & 2 & 1 & 3 \\ \end{array} $$ So, the answer for the first problem is $\boxed{1213}$. Show more…
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