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# Length: Comparing, adding and subtracting

## ​​In a nutshell

Length is how you describe how long an object is compared to another. You can compare the sizes of objects using length and for small enough objects you can use a ruler to measure this.

## Comparing length

Bigger objects have bigger lengths, so a $20cm$​ fork is bigger than a $5cm$​ eraser. Remember that you can only compare lengths if they have the same unit; an $11cm$ pencil is not longer than a $2m$​ table! Use this equation to convert between units:

$100cm = 1m = 0.001km$

#### procedure

 1 Make sure the units are the same. 2 Identify what the question is asking you:"Find the total length of ..." means summing the lengths."How much longer is ..." means subtracting one length from the other. 3 Convert the answer back into appropriate units (if required).

##### Example

How much longer is a $1.2m$​ table compared to a $65cm$​ chair?

$1.2m = 120cm$

$120 - 65 = \underline{55cm}$

## FAQs - Frequently Asked Questions

### What units are used to measure length?

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