Question

simplify this expression 20.25 - 9 1/2 +11 A. -1/4 b. 18.75 C 21 3/4 D. 40.75

Answer 1

The expression we need to simplify is

$20.25-9\frac{1}{2}+11$

First, let us convert the mixed number to a fraction:

$\begin{gathered} 9\frac{1}{2}=9+\frac{1}{2} \\ \end{gathered}$$\rightarrow9\cdot\frac{2}{2}+\frac{1}{2}$$\frac{19}{2}$

Now our expression has become

$20.25-\frac{19}{2}+11$

Adding 20.25 and 11 gives

$31.25-\frac{19}{2}$$\rightarrow31.25\cdot\frac{2}{2}-\frac{19}{2}$$\rightarrow\frac{62.5}{2}-\frac{19}{2}$$\rightarrow\frac{43.5}{2}$$\rightarrow21.75.$