Start with high-confidence fractions books, then narrow by subgenre or adjacent topics.
Give Me Half!
Stuart J. Murphy
Math Skillbuilders (grades 2 - 3)
Golden Books
Fraction Fun
David A. Adler
Fractions, Decimals, and Percents
If You Were a Fraction
Trisha Speed Shaskan
Sir Cumference and the Fracton Faire
Cindy Neuschwander
Fractions in Disguise
Edward Einhorn
Piece = Part = Portion
Scott Gifford
Third Grade Math Workbook Ages 8 to 9: 75+ Activities Multiplication & Division, Fractions, Area & Perimeter, Data, Math Facts, Word Problems, . . . (common Core)
Gold Stars
Third Grade Math With Confidence Complete Bundle
Kate Snow
The Ultimate Grade 3 Math Workbook
IXL Learning
The Ultimate Grade 4 Math Workbook (IXL Workbooks)
