B'rrrr. It's a cold snowy day and Farmer Bill is missing one of his mittens. The cow, three chickens and two horses are in the same pickle. Instead of having an even 2, 4, 6 or 8 mittens for their hands, hooves and feet, they've got 1, 3, 5 and 7. How odd! Can you guess who the barnyard mitten thief is?

Identifying the difference between odd and even numbers is essential to understanding our number system.