Length and distance (km/mm)：練習問題

A construction worker needs to measure the distance between two utility poles. He finds the distance is \( 0.045 \text{ km} \). How many metres is this distance?

A local hiking trail is \( 3 \text{ km} \) long. Tim has already walked \( 1500 \text{ m} \). How many metres does he have left to finish the trail?

A sticker is \( 4 \text{ cm} \) wide and a stamp is \( 25 \text{ mm} \) wide. What is the total width of the sticker and the stamp combined in millimetres?

A piece of decorative ribbon is \( 450 \text{ mm} \) long. How many centimetres long is the ribbon?

A wire is 15 cm 2 mm long. If a piece of length 85 mm is cut off, what is the remaining length of the wire in centimetres and millimetres?

A road is 12 km long. Street lamps are installed on one side of the road starting from the 0 km mark. If the distance between two adjacent lamps is 40 m, how many lamps are installed in total?

A local race track is \( 2 \text{ km} \) long. A runner has already completed \( 1350 \text{ metres} \) of the race.

a) What is the total length of the race track in metres?
b) How many more metres does the runner need to run to reach the finish line?
c) If the runner walks another \( 50000 \text{ mm} \), how many metres are left to finish the race?

A technician is measuring the thickness of different metal sheets using a high-precision tool.

(a) Sheet A is 12 mm thick and Sheet B is 1 cm 5 mm thick. What is the difference in their thickness in millimetres?
(b) If the technician stacks 8 layers of Sheet A and 5 layers of Sheet B, what is the total height of the stack in centimetres?