Draw a ring around the least significant figure in $123456$.

Round $4218$ to $1$ significant figure.

Round $37813$ to $1$ significant figure.

Round $0.0247$ to $1$ significant figure.

Round $0.004718$ to $1$ significant figure.

Round $103498$ to $3$ significant figures.

Round $6752081$ to $2$ significant figures.

Round $2.7842$ to $2$ significant figures.

Round $0.305287$ to $3$ significant figures.