Sounds like my daughter. She's consistently read from 3 to 4 grades higher since 1st grade. She's a word and letters person, I'm a numbers person.
I think it is a Visualization thing.
When I close my Eyes, I Can't see words. But when I look at something like this Total Nicotine = Total Nicotine equation ...
(initial volume) * (initial concentration) + (base concentration) * (X) = (target concentration) * (initial volume + X)
I see the "X" bound up with the initial volume. So it sounds like there will need to be Some Factoring Involved.