Left Toolbar > Math Nodes > Number Add
The Number Add node allows you to execute an addition operation on multiple Number values.
On the left toolbar choose Math Nodes > Number Add
Drag the Number Add icon into the Node Graph.
Connect the Number Node to the inputs to be added, or set its value in the attributes panel manually.
Connect the Output: result.
number A NUMBER type of value. This input grows automatically when a value is connected.
number The number value.
number_a The first term in the addition operation. This attribute is exposed as input by default.
number_b The second term in the addition operation. This attribute is exposed as input by default.