Math Problem Solver

\[ 7.45 - 70 = - \frac{1251}{20} = -62.55 \]

The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{7}{1}\), \(\frac{45}{100}\), and \(\frac{-70}{1}\) is \(100\). \[ \begin{aligned} 7.45 - 70 &= \frac{7 \cdot 100}{1 \cdot 100} + \frac{45 \cdot 1}{100 \cdot 1} + \frac{-70 \cdot 100}{1 \cdot 100} \\ &= \frac{700 + 45 + -7000}{100} \\ &= \frac{-6255}{100} \\&= - \frac{1251}{20} \end{aligned} \]