My recommendation below is not the equivalent of a Feynman's series for math, but one that is pegged much lower, for someone interested in basic remedial math.
It is called "Who is Fourier: A Mathematical Adventure".
I was tremendously surprised by this unusual gem of a book. It covers the range from basic arithmetic to logarithms, trigonometry, calculus to fourier series.
Oh No! That is an unfortunate link from Amazon where somebody is trying to hustle money. You don't need the 2nd edition since there is no change from the 1st which you can get for $10+ from many sites.
The book is quite good. It is written like a "Manga" book and hence has tons of drawings to help develop intuition for the concepts. It is written by a group of ordinary people with help from Scientists (a quirky club named Transnational College of Lex from Japan - https://en.wikipedia.org/wiki/Hippo_Family_Club ) and thus is very accessible. Highly recommended for High school students and above.
Note that the same group has also published two other books in the same vein; a) What is Quantum Mechanics b) What is DNA; both of which are also highly recommended.
It is called "Who is Fourier: A Mathematical Adventure".
I was tremendously surprised by this unusual gem of a book. It covers the range from basic arithmetic to logarithms, trigonometry, calculus to fourier series.
https://www.amazon.com/Who-Fourier-Mathematical-Adventure-2n...