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Using Advanced Expression Piping within your forms you can create mathematical formulas in order to calculate a value. The most common formula that can be used is the SUM function. This article will demonstrate how to configure a SUM expression using AEP within a form.

The SUM function will sum a list of values from a number of given fields and is the most commonly used function within expression piping. A SUM function can be created by listing the identifiers of the questions you want to add together.

The setup and formatting of the SUM expression are imperative in preventing an ** error** message from appearing on your form where the sum of your expression would normally appear. The first line of the SUM expression should be set up as follows:

{{ SUM(variable1,variable2) }} |

- Each expression is always contained within a pair of double braces {{ }}
- There should be a space between the first instance of SUM and the last bracket
- Variables you are using are case sensitive for the spelling of the Identifier
- Always close each SUM operation with brackets ( )

In addition to listing the values in specific text response cells and questions, you can also pull a SUM of Columns, Rows, and Ranges from Single- and Multi-Column questions, as well as Scores from closed-ended questions.

Sum of a Column | {{ SUM(q1[:0]) }} | Based on Grid Indexing, this will find the sum of column 1. |

Sum of a Row | {{ SUM(q2[1:]) }} | Based on Grid Indexing, this will find the sum of Row 2. |

Sum of a Range | {{ SUM(q1[0:4]) }} | Based on Grid Indexing, this will give you the sum of the first 4 cells. |

Sum of Scores | {{ SUM(q1.score,q2.score,q3.score) }} | The score given to each of the 3 questions will be added to the sum.NOTE: In this example, three questions have been given identifiers of q1, q2, and q3. These questions exist within the same form. |

**TIP!** Remember that the first row in a table is referred to as row 0 as it generally holds column headers. Looking at the sum of a row example above, if we were looking to calculate row 3, the expression would appear as {{ SUM(q2[2:]) }}.

{{ SUM(Q1[:0]) }} |

{{ SUM(Q1[0:]) }} |

{{ SUM(Q1[0:5]) }} |