A member called ACS seeking advice/a recommendation for an online course that he can share with his students to help them to 'brush up' on essential math skills in order to be better prepared for chemistry. If you have any suggestions please post here. Thank you in advance.
I highly recommend ALEKS for mathematics. It's widely used in HS and college and has lots of evidence to support its efficacy.
I used ALEKS for chemistry in my course. it includes basic math reviews as well.
After consulting with a math colleague, Khan Academy (specifically the Algebra 2 sequence) was suggested.