$$5 \frac { 1 } { 2 } + 9 \frac { 1 } { 2 } =$$
$15$
$$\frac{10+1}{2}+\frac{9\times 2+1}{2}$$
$$\frac{11}{2}+\frac{9\times 2+1}{2}$$
$$\frac{11}{2}+\frac{18+1}{2}$$
$$\frac{11}{2}+\frac{19}{2}$$
$$\frac{11+19}{2}$$
$$\frac{30}{2}$$
$$15$$
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$3\times 5$
