Grades 1-4
Ask Albert Einstein
So maybe your elementary school age child will not learn much Math with this book--the one problem shown involves the Pythagorean theorem and it shows the external tangent line touching two circles--but she may learn a few related things: who is Albert Einstein, why he came to America, where he worked and study, ... and how he actually helped some kids with their Math homework!
Easy as 1,2,3
This is a teacher's manual of sorts for those "seeking a primary-level presentation less restrictive than a text", as the author states in the introduction. The author recommends using Childcraft: How and Why Library by World Book's editions predating 1980 and The Everyday Science Sourcebook to go together with this guide, along with library books.