Identifying Upper and Lowers Bounds

I measure a pencil as 7cm, to the nearest centimetre. What is the upper bound?

I measure a pencil as 7cm, to the nearest centimetre. What is the lower bound?

The length of a classroom is 5.3m to one decimal place. What is the upper bound?

The length of a classroom is 5.3m to one decimal place. What is the lower bound?

The length of the Meditteranean Sea is 200km to the nearest 10km. What is the upper bound? (Don't write km)

The length of the Meditteranean Sea is 200km to the nearest 10km. What is the lower bound? (Don't write km)

The thickness of my phone is 8.04mm to 2 decimal places. What is the upper bound?

The thickness of my phone is 8.04mm to 2 decimal places. What is the lower bound?

Mr. Simon is 2m to the nearest cm. What is the upper bound of his height?

Mr. Simon is 2m to the nearest cm. What is the lower bound of his height?