Basic maths textbook for investing?

I am looking for a book explaining very basic maths with a lot of exercises for investing (stock market, bond market, corporate finance, interest rates, yields, etc.). For a newbie who hasn’t done any maths for 20 years. Current math level of a 10-to-12 year old. Thanks!

(The emphasis is on a lot of practice mainly to familiarise myself with the formulae.)