Measurement: แบบฝึกหัด

If an eraser is 5 cm long and a pencil is 15 cm long, how many erasers placed end-to-end would be the same length as the pencil?

A string is 30 cm long. After cutting off a piece, the remaining string is 12 cm long. How long was the piece that was cut off?

A container can hold 2 litres of water. If you use a 250 mL cup to fill the container, how many full cups of water are needed to fill it completely?

A ruler is 30 centimeters long. If you place two such rulers end-to-end, what is the total length in centimeters?

A rectangular garden has a length of 10 meters and a width of 5 meters. If a fence is built around the entire garden, what is the total length of the fence needed?

A rectangular garden is 8 metres long and 5 metres wide.
a) What is the perimeter of the garden?
b) If a fence is placed along one of the longer sides only, how long is that fence?