$$\frac { 1 } { 2 } + \frac { 1 } { 3 } + \frac { 1 } { 4 } + \frac { 1 } { 5 } =$$
$\frac{77}{60}\approx 1.283333333$
$$\frac{3}{6}+\frac{2}{6}+\frac{1}{4}+\frac{1}{5}$$
$$\frac{3+2}{6}+\frac{1}{4}+\frac{1}{5}$$
$$\frac{5}{6}+\frac{1}{4}+\frac{1}{5}$$
$$\frac{10}{12}+\frac{3}{12}+\frac{1}{5}$$
$$\frac{10+3}{12}+\frac{1}{5}$$
$$\frac{13}{12}+\frac{1}{5}$$
$$\frac{65}{60}+\frac{12}{60}$$
$$\frac{65+12}{60}$$
$$\frac{77}{60}$$
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$\frac{7 \cdot 11}{2 ^ {2} \cdot 3 \cdot 5} = 1\frac{17}{60} = 1.2833333333333334$
