Old complete set of home study booklets on mathematics from the 1940s, published by American School, Chicago, Illinois. There are 13 volumes in the set (14 booklets total as there are 2 copies of No. 12) and they are copyright 1930 (these are 1948 printing). These have some yellowing and spotting from age and a number of them have pen and pencil markings.

There are

No. 1 "Addition - Subtraction - Multiplication - Division"

No. 2 "Factoring - Cancellation"

No. 3 "Addition & Subtraction of Fractions"

No. 4 'Multiplication & Division of Fractions"

No. 5 "Decimals"

No. 6 "Percentage"

No. 7 "Denominate Numbers"

No. 8 "Powers & Roots"

No. 9 "Ratio and Proportion"

No. 10 "Equations - Formulas"

No. 11 "Graphs"

No. 12 & 13 "Mensuration" Parts 1 & 2