Subtract mixed 2

Subtract mixed numbers: 3 1/2 - 2 4/5 (3 and one half - 2 and four-fifths.) Remember you need to make these into improper fractions before subtracting.

Correct answer:

x =  7/10

Step-by-step explanation:

$$\begin{gathered} a=3\frac{1}{2}=3+\frac{1}{2}=\frac{3\cdot 2+1}{2}=\frac{6+1}{2}=\frac{7}{2}=3\frac{1}{2}=3.5 \\ b=2\frac{4}{5}=2+\frac{4}{5}=\frac{2\cdot 5+4}{5}=\frac{10+4}{5}=\frac{14}{5}=2\frac{4}{5}=2.8 \\ x=a-b=\frac{7}{2}-\frac{14}{5}=\frac{35}{10}-\frac{28}{10}=\frac{35-28}{10}=\frac{7}{10}=0.7 \end{gathered}$$

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