$$8 \frac { 7 } { 10 } - 6 \frac { 6 } { 10 } =$$
$\frac{21}{10}=2.1$
$$\frac{80+7}{10}-\frac{6\times 10+6}{10}$$
$$\frac{87}{10}-\frac{6\times 10+6}{10}$$
$$\frac{87}{10}-\frac{60+6}{10}$$
$$\frac{87}{10}-\frac{66}{10}$$
$$\frac{87-66}{10}$$
$$\frac{21}{10}$$
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$\frac{3 \cdot 7}{2 \cdot 5} = 2\frac{1}{10} = 2.1$
