State whether the following statements are true or false. Give reasons for your answers.
$(i)$ Every natural number is a whole number.
$(ii)$ Every integer is a whole number.
$(iii)$ Every rational number is a whole number
$(i)$ True ; since the collection of whole numbers contains all natural numbers.
$(ii)$ False ; as integers may be negative but whole numbers are positive. For example : $-\,3$ is an integer but not a whole number.
$(iii)$ False ; as rational numbers may be fractional but whole numbers may not be. For example: $\frac {1}{5}$ is a rational number but not a whole number.
Add $2 \sqrt{2}+5 \sqrt{3}$ and $\sqrt{2}-3 \sqrt{3}$
Show that $3.142678$ is a rational number. In other words, express $3.142678$ in the form $\frac {p }{q }$, where $p$ and $q$ are integers and $q \ne 0$.
Visualise $4. \overline{26}$ . on the number line, up to $4$ decimal places.
Express the following in the form $\frac {p}{q}$, where $p$ and $q$ are integers and $q \ne 0$.
$(i)$ $0 . \overline{6}$
$(ii)$ $0 . 4\overline{7}$
$(iii)$ $0 . \overline{001}$
Rationalise the denominator of $\frac{5}{\sqrt{3}-\sqrt{5}}$.