We're working on composing and decomposing numbers up to 5 in math. Since it was such a beautiful day, we went outside and collected leaves and acorns, and brought them inside. Next we took a sheet of plain manila drawing paper, and I asked them to draw 5 circles. Then they were to glue a leaf or acorn inside the circle. (This made the project a multi-step activity, which I could observe and grade.) Right off the bat, I could tell which students had one-to-one correspondence skills, and which didn't.