Dona Herweck Rice 
Your World: Hats [PDF ebook] 
Classifying

Count, sort, and classify the dress-up hats, cowboy hats, and silly hats! Beginning readers will enjoy learning to classify and sort objects with this brightly illustrated math book. Featuring vivid images and easy-to-read text, this full-color book develops students’ math and reading skills and introduces them to early STEM themes. The Math Talk section includes questions that will increase understanding of basic math and reading concepts and develop students’ speaking and listening skills. Learning math is fun and easy with this engaging text!