Math Problem Solver

$$3.96 + 3.1 + 0.63 = \frac{769}{100} = 7.69$$

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of $\frac{3}{1}$, $\frac{96}{100}$, $\frac{3}{1}$, $\frac{1}{10}$, and $\frac{63}{100}$ is $100$. $$\begin{aligned} 3.96 + 3.1 + 0.63 &= \frac{3 \cdot 100}{1 \cdot 100} + \frac{96 \cdot 1}{100 \cdot 1} + \frac{3 \cdot 100}{1 \cdot 100} + \frac{1 \cdot 10}{10 \cdot 10} + \frac{63 \cdot 1}{100 \cdot 1} \\ &= \frac{300 + 96 + 300 + 10 + 63}{100} \\ &= \frac{769}{100} \end{aligned}$$