Say you are using the speed of light a lot in your calculations in `GeoGebra`

, and you find it a bit inconvenient to write “$299\phantom{\rule{0.17em}{0ex}}792\phantom{\rule{0.17em}{0ex}}458$ m/s” over and over. Instead, you can assign the prefix `c`

to the value $299\phantom{\rule{0.17em}{0ex}}792\phantom{\rule{0.17em}{0ex}}458$. Then you can just type `c`

instead of $299\phantom{\rule{0.17em}{0ex}}792\phantom{\rule{0.17em}{0ex}}458$ in your calculations.

This is why prefixes are so useful. The advantage of prefixes is that you can store any value in `GeoGebra`

, so that you don’t have to type it over and over. It looks good too!

In order to use prefixes in `GeoGebra`

, you have to make them yourself first. You can do this by entering them into the `Algebra View`

. For example, if you want to create a prefix “k” in “kilo” as a value, you can type `k = 1000`

in `Algebra View`

.

`GeoGebra`

Instruction 1

- 1.
- Open
`CAS`

under`View`

in`Menu`

. - 2.
- Enter
<name of prefix> = <value of prefix>

in

`Algebra View`

and press`Enter`

. - 3.
- The prefixes you make can be found in
`Algebra View`

. They can now be used for calculations in`CAS`

, by simply writing the prefix instead of the value assigned to it.

Example 1

**Compute $\text{}32\text{}\phantom{\rule{0.17em}{0ex}}\text{ML}\times \text{}11\text{}\phantom{\rule{0.17em}{0ex}}\text{dL}$ and $\text{}0.02\text{}\phantom{\rule{0.17em}{0ex}}\text{kg}+\text{}3500\text{}\phantom{\rule{0.17em}{0ex}}\text{dg}$ **

By applying the instructions above, `GeoGebra`

helps you find the answers quickly, as you can see below: