One Is a Snail, Ten Is a Crab: A Counting by Feet Book
Illustrated by:
While you're on the beach, you can count from 1 to 10 by feet combining numbers of feet and then multiplying them all the way to 100, which is ten crabs
or 100 snails if you really count slowly! Colorful, bug-eyed, cartoon-like critters further enliven this jaunty approach to numbers.