Math Problem Solver

\[ 4 - 0.7 = \frac{33}{10} = 3.3 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{4}{1}\) and \(\frac{-7}{10}\) is \(10\). \[ \begin{aligned} 4 - 0.7 &= \frac{4 \cdot 10}{1 \cdot 10} + \frac{-7 \cdot 1}{10 \cdot 1} \\ &= \frac{40 + -7}{10} \\ &= \frac{33}{10} \end{aligned} \]