Answer
$\sqrt {30} = 5.5$
$\sqrt {26} = 5.1$
$\sqrt {35} = 5.9$
Work Step by Step
$30$ is in the middle of $25$ and $36$ so $\sqrt {30}$ is approximately $5.5$
$26$ is almost $25$ so $\sqrt {26} = 5.1$
$35$ is almost $36$ so $\sqrt {35} = 5.9$