The rationalising factor of $5 \sqrt{2}$ is ..............

Simplify: $\frac{\sqrt{4-\sqrt{7}}}{\sqrt{8+3 \sqrt{7}-2 \sqrt{2}}}$

According to Euclid's division lemma,for given positive integers $a$ and $b,$ there exist unique non-negative integers $q$ and $r$ such that $a = bq + r,$ where ...........

Find $g.c.d.$ of $210$ and $55$ by Euclid's algorithm.

If $n$ is an odd integer,then $n^{2}-1$ is divisible by...........

$\sqrt{12}$ and ........ are like surds.