# Taking Points from Total - Decremental Score

You can implement in iDoceo a Grade that only takes away points from the total, which every student starts with. The total points can be of any numeric value (100, 20, 15, etc.), as well as, the points you take away from it (-5.5, -10, -1, etc.). Icons are going to be used to set uo the total and the decremental values.

If you will like to be able to add points as well, this can be done the same way with additional icons, it will be explained further on the article.

In this example we will take a grade of a 100 and a decrease of 5 and 10 points when we see fit.

Here you will introduce the maximun value as 100, the minimun as 0, the passing grade that you want and name the grade.
Now go to the "Icons" section. Here you are going to choose the icons you want to use.

The first icon you choose will be the one with the value of the total points you are using. In this case, it will be an icon that has a value of 100, the green check. This icon will be used so all students start with the maximun grade.

After that you choose the icons that will carry a negative value to take points from the total. Just click on them and in the numeric keypad enter the - sign first, and then the value, for this case -5 and -10.
Make sure to select OK to save changes and the grade would be created and ready to use.
iDoceo has many more icons available in the icon's library which you can use (Menu > Settings > icons > add). More details on how to enable the extra icons for use anywhere in iDoceo here.

#### The category

In your class, you will create a category, which will serve to show the total points each student has. After naming the category you can choose as grade type a numeric grade (generic) of the total points being used, in this case 100, and set the calculation as "Simple Addition".
You can choose a Numeric Grade you have created that is over 100 as well. A numeric grade will allow you to choose a passing grade and add colour to your results.

#### The day zero column

The next step is to create a column where you will add for all students the icon with the maximum value (green check for this case), so all of them start with full points. Make sure to assign the new grade as the grade type of this column. It must be inside the category.
You can create columns directly inside a category by long tap on the category > Add column.

#### The control columns

All you need now are the columns where you are going to add the negative value icons to take away points as you see fit. All of them must have as grade type the new grade.

In this example, we are creating 10 homework columns. If a student does not present a homework, he will get a red x (-10), and if it is an incomplete homework, it will be a red sad face (-5). If all is correct, then the cell is left empty, so he does not loose points.

The final result will look like the image below.
You may want to hide the "Day Zero" column. You can do it by a long tap on it > Hide.

To do it, you just need to go to the new grade > icons > select the icon or icons you want and give them a positive value.
Here we have chosen the green happy face and given it a value of 5.
After that you can add the green happy face anywhere you want. In this example, we have added two columns called Recovery Columns, were we will award the positive points. It will look like the image below.

### Quickly adding the icons to the cells: Custom Editor

You can create a Custom Editor with the icons you are going to use and assign it to the control columns as the Cell editor. You create a custom editor from Menu > Settings > Custom Editor
When you double click on a cell the icons of the custom editor will appear on the right for all students in that column, just click one to add it.

### Adding columns with one click: Favourite Columns

If you are going to be using several column, like an everyday control column, you can either copy and paste the column or use the favorite column option. With the latter one you can add a column already configured inside the category with just one click, and if you want it, it will come with the current date as well.

Below there is a video that show the process of creating a favorite column in detail. It shows a different example but the procedure is the same.