"good at mathematics" is a perfectly acceptable and usable phrase in written English.
You can use it to describe someone's facility with math, such as in the sentence "He was always good at mathematics and scored well on his math tests."
Before that I was a kid who was good at piano in the same way I was good at mathematics.
Chess stimulates the mind; we have kids who are very good at mathematics and it may be because of chess".
Mother and children were caught by the Kenyan authorities trying to flee across the border into Kenya.As a boy, Mr Fazul was good at mathematics.
Muslims, who were good at mathematics, did sums for the Sicilian treasury, and Greeks, who were born sailors, provided the kingdom with admirals.
Though the research showed that even girls who were good at mathematics were much less likely to choose physics and information technology than equally skilled boys, when girls did choose those subjects they actually performed better, on average, than boys.
Here's an excerpt from the interview on the show, which is scheduled to air after the post-game report Wednesday: I always thought I was real good at mathematics, because I would always count her tip money.
"Many girls who think they are not good enough at mathematics to study physics and information technology could succeed at these subjects and should be encouraged to try," Méndez said.
They were resilient and they were good at their mathematics.
Blackstone was particularly good at Greek, mathematics and poetry, with his notes on William Shakespeare being included in George Steevens' 1781 edition of Shakespeare's plays.
Be good at math! Physical chemistry relies heavily on mathematics.
Example item M SD Internal consistency Domain-specific Self-concept in mathematics 3 I've always been good at math.
