$$\left({\frac{{\mathtt{7}}}{{\mathtt{10}}}}\right){\mathtt{\,\times\,}}\left({\frac{{\mathtt{27}}}{{\mathtt{7}}}}\right) = {\frac{{\mathtt{27}}}{{\mathtt{10}}}} = {\mathtt{2.7}}$$
.You have two choices: Multiply directly or simplify first.
Note that you can divide 10 and 24 by 2 -->
7/5 * 12/7
Now, cross out the 7's -->
1/5 * 12/ 1
12/5
You are left with 12/5 or 2.4.
$$\left({\frac{{\mathtt{7}}}{{\mathtt{10}}}}\right){\mathtt{\,\times\,}}\left({\frac{{\mathtt{27}}}{{\mathtt{7}}}}\right) = {\frac{{\mathtt{27}}}{{\mathtt{10}}}} = {\mathtt{2.7}}$$