長度（mm, cm, m, km）：练习题

A piece of ribbon is 3 m long. After using 45 cm to wrap a gift and another 120 mm to make a small bow, what is the length of the remaining ribbon in centimetres (cm)?

A wire is \(5.4\text{ m}\) long. It is cut into several pieces, each with a length of \(15\text{ cm}\). How many pieces can be cut from the wire?

An athlete runs around a square field with an area of \(0.09\text{ km}^2\). If he runs around the field \(5\text{ times}\), what is the total distance he covers in metres?

A string of beads is 48 cm long. If each bead is 8 mm wide, how many beads are there in the string?

A stack of 50 identical coins has a total thickness of 12 cm. What is the thickness of each coin in millimetres (mm)?

A rectangular path is 25 m long and 80 cm wide. What is the difference between the length and the width of the path in millimetres (mm)?

A length of ribbon is 1.8 m long. If Amy cuts it into 6 equal pieces, what is the length of each piece in centimetres (cm)?