Adding Decimals: How do I add 0.25 and 0.75?

To add 0.25 and 0.75, line up the decimal points and then add the digits.

\[
\begin{array}{c}
\phantom{0}0.25 \\
+\phantom{0}0.75 \\ \hline
\phantom{0}1.00
\end{array}
\]

So, 0.25 plus 0.75 equals 1.00. Remember to carry over any extra digits from the tenths place to the ones place if necessary. Adding decimals is as simple as adding whole numbers, as long as you keep the decimal points aligned.