Roll out the potato candy to a 12-by-10-inch rectangle (about ¼-inch thick), dusting the top with powdered sugar if it becomes sticky. Spread the peanut butter in an even layer over the potato candy.

Next, cut the bottom board: a rectangle measuring 21.5 by 10.5 inches ... each spaced about 1 inch apart and measuring 4.5 ...

A unit fraction is any fraction where the numerator is 1, eg ¼. A non-unit fraction is a fraction where the numerator is not 1, eg ⅘. Mixed fractions are a mix of whole numbers and a fraction ...