Ctrl+k

Choose centimetres or metres

Choosing between centimetres and metres involves judging the scale of a length: centimetres suit relatively small objects or short distances, while metres suit larger objects or distances. The unit choice does not change the length, and the relationship 1 metre=100 centimetres1\text{ metre}=100\text{ centimetres} explains why its numerical measure changes; decimal measures and complex unit conversions are not included.

Detailed Explanation: Choose centimetres or metres

To choose a unit, think about the size of the object or distance:

  • Use centimetres (cm) for small objects, such as a pencil or a book.
  • Use metres (m) for larger objects or distances, such as a door or a classroom.

Remember:

1 metre=100 centimetres1\text{ metre}=100\text{ centimetres}

Example: A classroom door is about 2 units tall. Should we use centimetres or metres?

  1. A door is a large object.
  2. Large objects are best measured in metres.
  3. So, we would say the door is about 2 metres tall.

The length stays the same if we use a different unit. Since 11 metre equals 100100 centimetres, 22 metres equals 200200 centimetres. Metres are the better choice because the door is large.

Learn by doing: Choose centimetres or metres

Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill

    Practice with unlimited practice problems

    Measurement - Estimate Length - Choose Unit (Metric)

      ?