Represent $\sqrt{20}$ on the number line.
Add $: 0 . \overline{3}+0.4 \overline{7}$
Find three rational numbers between $\frac{1}{7}$ and $\frac{3}{7}$
Classify the following numbers as rational or irrational with justification:
$(i)$ $\sqrt{196}$
$(ii)$ $3 \sqrt{18}$
Every rational number is
The number obtained on rationalizing the denominator of $\frac{1}{7-\sqrt{2}}$ is