At my school, we use numbers to assess noise level. Within a normal day, the students often forget which noise level to work at a number of times. Though I have provided a "voice check" at the front of the room, the students don't always think to look up.
That is where this set of cards comes in! Before having the students work, I ask the students to flip to the card, show me, and slip it into their desk pockets! Without having to look up, the students can quickly see what noise level they should be at.
These cards pair nicely with my Voice Check Posters