Find \(\frac{7}{10}+\frac{5}{100}\)

Think: Write the addends as fractions with a common denominator.

\(\begin{align}
\frac{\blacksquare}{100}+\frac{\blacksquare}{100}&= \frac{\blacksquare}{\blacksquare}
\end{align}\)

\(\begin{align}
\frac{20}{100}+\frac{\blacksquare}{10}&= \frac{60}{100}\\
\end{align}\)

\(\begin{align}
\frac{2}{10}+\frac{\blacksquare}{100}&= \frac{90}{100}\\
\end{align}\)

Jerry had 1 gallon of ice cream. He used \(\frac{3}{10}\) gallon to make chocolate milkshakes and 0.40 gallon to make vanilla milkshakes. How much ice cream does Jerry  have left after making the milkshakes?