Suggestion

[bogdanbacosca]

Will this make the idea more clear or the text more readable?

Replacing:
Numeric conversion happens in mathematical functions and expressions automatically.
With:
Numeric conversion in mathematical functions and expressions happen automatically.

[joaquinelio]

Suggested change

	Numeric conversion in mathematical functions and expressions happen automatically.
	Numeric conversion happens automatically in mathematical functions and expressions.

warning I am not a native eng speaker

[bogdanbacosca]

@joaquinelio your version looks good too

[joaquinelio]

or, (I like it more but I'm not sure if I can start a sentence this way)

Suggested change

	Numeric conversion in mathematical functions and expressions happen automatically.
	In mathematical functions and expressions, the numeric conversion happens automatically.

[GopalanHarish]

As a non-native English speaker, the original text "Numeric conversion happens in mathematical functions and expressions automatically." is easier to understand.

[joaquinelio]

The original sounds weird to me (non-native too)

I liked that the suggestion put the words "happens automatically" together

It would be easier to read with commas.
Numeric conversion, in mathematical functions and expressions, happens automatically.

My suggestion
In mathematical functions and expressions, the numeric conversion happens automatically.

[iliakan]

Numeric conversion in mathematical functions and expressions happens automatically|? ;)

[joaquinelio]

It seems ok...
for this non-native at least :)

[bogdanbacosca]

@iliakan I have updated the PR with your suggestion.