Counting sticks when there is something to count and a reason to care. A missing button. Ducks in groups. Dots that turn into a picture. A worksheet can wait.
Chicka Chicka 1, 2, 3 and Ten Black Dots are the youngest books here. Pete the Cat and Quack and Count still feel like stories. Measuring Penny and The Grapes of Math are for the kindergarten child who likes a puzzle and will tolerate a few more words.
Let them answer before you do. If they get it wrong, point and count together instead of correcting from across the couch. The book is the game.
One math book in the stack is enough. Put a regular story next to it so reading does not start to feel like school.
Count real things after you close the book. Buttons on a shirt, ducks in the tub, crackers on a plate. The page was the practice. The snack is where they find out they can do it without you pointing.