Looking on the internet deeply has found these results:

I'm good at numbers is the most popular phrase on the web.

I'm good in numbers 12 results on the web	I'm good at numbers 1879 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
'Enjoy your work and it won't be a work any more but a hobby' such could be my professional motto. I like what I do and it gets me results. I'm good in numbers�... Sep 28, 2014 ... No problem with that because I'm not a teacher and I am accountant. I'm good in numbers, yeah!!! posted on 29 Sep 2014, 19:12 1. in response�...	Apr 30, 2015 ... Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Jobs and Careers: I'm still in college right now, but I�... Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Does it make sense to say that I'm good in math but I don't know a lot�... Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Frequently asked in. UpdateCancel�... Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Math Competition Problems: Consider the linear field of square 2x2�...

I'm good in numbers

12 results on the web

I'm good at numbers

1879 results on the web

More popular!

'Enjoy your work and it won't be a work any more but a hobby'
such could be my professional motto. I like what I do and it gets me results. I'm good in numbers�...
Sep 28, 2014 ... No problem with that because I'm not a teacher and I am accountant. I'm good in numbers, yeah!!! posted on 29 Sep 2014, 19:12 1. in response�...

Apr 30, 2015 ... Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Jobs and Careers: I'm still in college right now, but I�...
Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Does it make sense to say that I'm good in math but I don't know a lot�...
Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Frequently asked in. UpdateCancel�...
Mental Math: When a person says: "I'm good at numbers," what does that actually mean? Math Competition Problems: Consider the linear field of square 2x2�...