This is the fourth in the High School Math Series Topics in Mathematics, delineated year by year from Ninth through Twelfth Grades. This book, as with the others, is based on teaching practices in Waldorf Schools and covers all topics in the curriculum for, in this case, the ninth grade. Eighteen essays by eighteen different and experienced Waldorf teachers will give new high school math teachers - and all high school math teachers - limitless stimulants for good ideas and comprehensive curriculum coverage for the ninth grade in Waldorf schools. This is a "must have" for high school math teachers. There is no other resource like this one