Math Operation (Example)

UC_MathOperation is the general-purpose one: two values in, a dropdown to pick Add, Subtract, Multiply, or Divide, and one result out. You might wonder why it exists alongside dedicated UC_MathAdd and UC_MathMultiply nodes. The honest answer, and the author's own label gives it away: its display name is literally "Math Operation (Example)". It's a demonstration of the pattern - and in most real workflows you're better off with the specific nodes.

Why you'd reach for it

There is exactly one situation where this node earns its keep: when you want to switch operations at runtime. Because the operation is a dropdown, you can convert that widget to an input and have another node choose the arithmetic. That's a genuinely rare need in a normal workflow - usually you know whether you're adding or dividing. For everything else, the dedicated nodes are the better pick.

Why the dedicated nodes are usually better

This one's inputs and output are typed as * (ANY), which means ComfyUI won't type-check anything on the way in or out. The dedicated siblings use the pack's MatchType template, which constrains inputs to int/float and mirrors the output type - that catches wiring mistakes before they run and makes the result predictable. This node, by contrast, will happily take anything and hand back whatever the operation produced. It also has one sharp edge the siblings don't: the Divide operation here has no zero guard, so dividing by zero raises an error, whereas UC_MathDivide can be told to return 0 instead.

The inputs that matter

• value_a and value_b - the two operands (ANY type).
• operation - the dropdown: Add (default), Subtract, Multiply, or Divide.

One result output comes out the other side.

Installing it

Part of ComfyUI-UtilsCollection. ComfyUI Manager → search "ComfyUI-UtilsCollection" → Install → restart, or:

cd ComfyUI/custom_nodes
git clone https://github.com/silveroxides/ComfyUI-UtilsCollection

Restart. Light deps (opencv-python, typing-extensions), no model downloads.

The takeaway

If you're browsing the node list and this one catches your eye, the useful thing to know is that it's a teaching node - a worked example of how the math family is built. Reach for UC_MathAdd, UC_MathMultiply, or UC_MathDivide for real work, and you get type safety plus the autogrow multi-input forms for free. Reach for this only when you genuinely need to swap the operator at runtime. It's not bad - it's just the demo, and it's refreshingly honest about being the demo. (And yes, like the rest of the math section, it replaces the old ComfyUI-LogicMath equivalent - accept the swap, remove LogicMath.)