Math Problem Solver

\[ 66.6 + 66.6 = \frac{666}{5} = 133.2 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{66}{1}\), \(\frac{6}{10}\), \(\frac{66}{1}\), and \(\frac{6}{10}\) is \(10\). \[ \begin{aligned} 66.6 + 66.6 &= \frac{66 \cdot 10}{1 \cdot 10} + \frac{6 \cdot 1}{10 \cdot 1} + \frac{66 \cdot 10}{1 \cdot 10} + \frac{6 \cdot 1}{10 \cdot 1} \\ &= \frac{660 + 6 + 660 + 6}{10} \\ &= \frac{1332}{10} \\&= \frac{666}{5} \end{aligned} \]