If he can solve this for x:
(2x/16)+2.5y = 14y^2 + 1/2z - .8x
If he can calculate the slope of a line that starts at coordinate (3,12) and ends at (16, 3).
If he can calculate the area under that line.
If he can understand why dividing a measured 3.0 grams into four even samples results in four samples weighing 0.8 grams each and not 0.75 grams.
If he understands the math for
calculating standard deviation (and, better yet, understands why it is important and what it means).
If he can drum the number 6.02x10^23 into his head and understand what it means.
Then he probably has enough grasp of the math of early chemistry to keep up.