Are you looking for a cool way to incorporate technology into your classroom? Look no further... QR codes help make great self-checking centers.
This pack has students rounding to the nearest 10, 100, and 1000. There are 2 sets.... a normal center where they round and write their answers on the blanks AND a QR self-checking version. You just need a phone or an iPod with a QR reader app (I use Red Laser).
There is a recording sheet and a poster to hang in the classroom (5 or more, raise the score... 4 or less, let it rest)