Molly is wrapping up parts of sandwiches to sell at her sandwich cart. she cuts each sandwich in fourths and then wraps each fourth separately. she says that she wrapped 16 fourths, so she wrapped 16 whole sandwiches. what was molly's mistake?

Since Molly wrapped each fourth separately, she was only wrapping one fourth of a sandwich every time she made a wrap. She claimed that she wrapped 16 whole sandwiches, but she actually only wrapped 16 fourths. This means that she wrapped 4 whole sandwiches, not 16.

She only wrapped 4 sandwiches. Four fourths is equivalent to a whole sandwich. :)