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Measure length in centimetres

Length in centimetres is understood as the number of equal 1-centimetre units that span an object from one endpoint to the other; a ruler is interpreted by aligning its zero point with an endpoint and reading the mark at the other endpoint, rather than counting numeral labels. Learners compare and order lengths and determine or estimate measurements in whole centimetres, supporting later work with perimeter and unit relationships; fractional centimetres, millimetres, decimals, and formal conversions between units are not included.

Detailed Explanation: Measure length in centimetres

To measure an object in centimetres:

  1. Put the 0 mark on the ruler exactly at one endpoint of the object.
  2. Keep the ruler straight along the object.
  3. Look at the mark where the other endpoint reaches.
  4. Read that number. It tells the length in centimetres.

Do not count the printed numbers. The spaces between the marks are the equal 11-centimetre units.

Example: A crayon is placed along a ruler.

  • The left end of the crayon lines up with 00.
  • The right end lines up with 66.
  • So the crayon is 6 cm\boxed{6\text{ cm}} long.

We can check by counting the spaces from 00 to 66: there are six 11-centimetre spaces.

Learn by doing: Measure length in centimetres

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    Measure with Ruler (metric) - Whole Centimeters from Start

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