#### Mathematics

Botmother has helpers for all basic mathematical operations. All math heplers are linear.

## Addition

You need helper "add" to add two numbers together:

{{add variable1 variable2}}

As in block helpers, in linear ones you can specify not only variables, but also literal values:

{{add 5 100}}

105 will be sent in a message.

If you need to add several numbers or variables, you can use helper "sum":

{{sum var1 var2 var3}}

It sums variable var1, variable var2 and variable var3.

## Subtraction

We use helper "subtract" to subtract one number from another.

{{subtract variable1 variable2}}

## Multiplication

We can use helper "multiply" to multiply one number by another:

{{multiply variable1 variable2}}

## Division

We can use helper "divide" to divide one number by another:

{{divide variable1 variable2}}

## Rounding

To round the resulting numbers to two decimal places, use component Assign a variable. Write value "var" in the final variable:

{{toRub variable}}

Where "variable" is the variable obtained after calculations.

You can also use **Assign a variable** component to round the resulting numbers to a specified number of decimal places. In the final variable, write the value:

{{toFixed 1.1234 2}}

Where **2** is the number of digits that should remain after the decimal point, and **1.1234** is the number in which you need to reduce the number of digits after the decimal point. Instead of a number, there may be a variable in which the number had been previously written, for example **{{toFixed var2}}**

If you need to create a variable with a fractional number after the dot, use helper:

{{toFixedRub variable ','}}

You can use the following helpers to round to an integer:

**floor**- always rounds down;**ceil**- always rounds up;**round**- rounds according to the rules of mathematics

Example:

{{variable 5.6}} {{floor variable}}

As a result, the value of the variable will be rounded to 5.

## Number module

Here is how you can calculate the number module (if the number is negative, delete the minus, if the number is positive, don’t change it):

{{abs number}}

where **number** is a variable with a number.