How easy are these for studying pennies, nickels, dimes, and quarters? From Classroom Freebies: Coin Popsicle Stick Puppets
Cupcake lines aren't just for crafts! Use them to practice counting coins! Math with Cupcake Liners: Counting Money Game
Four Activities for Coin Counting Practice « Frugal Fun For Boys
FREE Printable Coin Puzzles - This Reading Mama (for older kids, of course)
Coin sorting is super easy kid entertainment! Keeps them busy and teaches pre-math skills.