Is "equals to," as in "one plus one equals to two," ungrammatical? [closed]

I study mathematics alongside many Chinese students. They will often use the phrase "equals to," as in "one plus one equals to two." Is this usage incorrect?

To use equal as a verb, consider two examples of the many dictionary definitions:

equal (verb) = to have the same value, size, etc as something else, often shown using a symbol (=):

"Two plus two equals four."

Cambridge

equal: transitive verb

to be equal to especially : to be identical in value to

Merriam Webster

Hence we say "2+2 equals 4" (The Cambridge example)

This is equivalent to saying "2+2 is identical in value to 4" (the Merriam Webster example)

To say "2+2 equals to 4" fits neither of these usages. It is therefore incorrect, or at least it uses "to" unnecessarily.