78.5 - 100
You asked:
Evaluate the expression: \(78.5 - 100\)
MathBot Answer:
\[ 78.5 - 100 = - \frac{43}{2} = -21.5 \]
The sum can be computed by rewriting each term over a common denominator, where the least common denominator of \(\frac{78}{1}\), \(\frac{5}{10}\), and \(\frac{-100}{1}\) is \(10\). \[ \begin{aligned} 78.5 - 100 &= \frac{78 \cdot 10}{1 \cdot 10} + \frac{5 \cdot 1}{10 \cdot 1} + \frac{-100 \cdot 10}{1 \cdot 10} \\ &= \frac{780 + 5 + -1000}{10} \\ &= \frac{-215}{10} \\&= - \frac{43}{2} \end{aligned} \]