Start with high-confidence measures & weights books, then narrow by subgenre or adjacent topics.
Janice Vancleave's Geometry for Every Kid
Janice VanCleave
Fraction Fun
David A. Adler
Fractions, Decimals, and Percents
Seeing Symmetry
Loreen Leedy
Things That Float and Things That Don't
Squares, Rectangles, and Other Quadrilaterals
Graphs!
If You Were a Fraction
Trisha Speed Shaskan
How Heavy?
Mark Weakland
How Long?
Jessica Gunderson
Measuring Up: How Oliver Smoot Became a Standard Unit of Measurement
Jenny Lacika
What's Your Angle, Pythagoras?
Julie Ellis
Sir Cumference and the Fracton Faire
Cindy Neuschwander
Fractions in Disguise
Edward Einhorn
Pythagoras and the Ratios
Sir Cumference Gets Decima's Point
Piece = Part = Portion
Scott Gifford
