# Simple Arithmetic Operation

Suppose there is a variable, and we substitute a value into it and perform the arithmetic operation indicated in the illustration below, that is: $Variable Name + 100.

![](https://sherparpa.ru/wp-content/uploads/2023/11/image65-661w343h-2.png)

If in the first example the number 100 is enclosed in quotes, it will no longer be a numerical operation, but a string operation, i.e., one string is added to another string, and the text value contained in the variable will have the value “100” appended as part of the string.

**Properties of Composite Data Types**

Some composite data types have the ability to invoke properties or functions. For example, the table MyTable has a property Rows, and this property has a property Count. The expression MyTable.Rows.Count allows you to get the number of rows in the given table.