My students need to classify numbers within the real number system, but I don't really like boring worksheets. This activity was inspired by a coworker. The students get a colored sheet of numbers and a Venn diagram of the real number system. They cut out the numbers and paste them into the smallest appropriate subset. The directions also specify that students should label each subset.
The students love this activity because it feels like the "arts and crafts" of elementary.
*I usually require that students get checked before pasting.*