Lengths
Comparing Lengths
Method Line Up to Compare Lengths
To compare the length of two objects, line them up side by side. The object that looks taller is the longer one.
Example
The girl is taller than the boy.
Measuring Lengths
Method Measure Length with Objects
To measure the length of an object, use small things like blocks or erasers. Line them up next to the object and count how many fit along its length.
Example
The cucumber measures 4 erasers long.
Units of Length
We can measure length using different units like blocks or erasers. But these units are not the same for everyone. Your friend might have a longer eraser than yours, making it hard to compare. To solve this, mathematicians created a universal unit called the meter, so everyone can measure and compare lengths the same way.
Definition Units of Length
- Centimeter \(\left(\mathrm{cm}\right)\): A small unit of length, about the width of your finger.
- Meter \(\left(\mathrm{m}\right)\): A longer unit of length, about the height of a girl.
