The last digit of $10^{n}$ for any integer $n \geq 1$ is ............

By using the fact $g.c.d.(a, b) \times l.c.m.(a, b) = a \times b$,find $l.c.m.(96, 404)$.

$\frac{47}{500}$ has $\ldots$ digits after the decimal point in its terminating decimal expansion.

The following real number is expressed in decimal form. Determine whether it is rational or not. If it is rational,express it in the form of $\frac{p}{q}$. $18.484848 \ldots$

The smallest positive number greater than $5$ such that when it is divided by $20, 30,$ or $40,$ it leaves the remainder $5$ is:

Prove that $\sqrt{7}$ is an irrational number.