Exercises: addition and subtraction of decimal numbers

$\begin{array}{l}1.04-\frac{1}{2}\\ \end{array}$

First, convert $\frac{1}{2}$ into a decimal number.

$\begin{array}{l}1.04-0.5\\ \end{array}$

Subtract the two decimal numbers in columns.

$\begin{array}{l}\begin{array}{l}\phantom{-}1.04\\ \underline{-0.50}\\ \phantom{-}0.54\end{array}\\ \end{array}$

Alternative solution

$\begin{array}{l}\frac{6}{3}-0.23\\ \end{array}$

You may first shorten $\frac{6}{3}=2$ and then subtract the two decimal numbers. For this, write $2$ as $2.00$.

$\begin{array}{l}\phantom{-}2.00\\ \underline{-0.23}\\ \phantom{-}1.77\end{array}$

Alternative solution

$1.8-\frac{1}{8}-0.08$

Since there are already two decimal numbers, you may also convert $\frac{1}{8}$ into a decimal number.

$=1.8-0.125-0.08$

$=1.595$