Round up the following numbers to three significant figures:
$(i)$ $34.216$
$(ii)$ $10.4107$
$(iii)$ $0.04597$
$(iv)$ $2808$

To round to three significant figures:
$(i)$ $34.216$: The fourth digit is $1$ $(<5)$,so we keep the third digit as is. Result: $34.2$
$(ii)$ $10.4107$: The fourth digit is $1$ $(<5)$,so we keep the third digit as is. Result: $10.4$
$(iii)$ $0.04597$: The fourth digit is $9$ $(>5)$,so we round up the third digit ($9$ becomes $10$,carrying over to the second digit). Result: $0.0460$
$(iv)$ $2808$: The fourth digit is $8$ $(>5)$,so we round up the third digit ($0$ becomes $1$). Result: $2810$