$$\quad 6 \frac { 1 } { 5 } + ( - 2 \frac { 3 } { 10 } )$$
$\frac{39}{10}=3.9$
$$\frac{30+1}{5}-\frac{2\times 10+3}{10}$$
$$\frac{31}{5}-\frac{2\times 10+3}{10}$$
$$\frac{31}{5}-\frac{20+3}{10}$$
$$\frac{31}{5}-\frac{23}{10}$$
$$\frac{62}{10}-\frac{23}{10}$$
$$\frac{62-23}{10}$$
$$\frac{39}{10}$$
Show Solution
Hide Solution
$\frac{3 \cdot 13}{2 \cdot 5} = 3\frac{9}{10} = 3.9$
