This is an activity that was created a few years ago to meet Mississippi math standards for third grade; however, I have revamped this activity to correlate with the new Common Core Standards. After teaching the lesson on inverse operations for addition and subtraction, the students can complete the following activity in a center. This lesson is based on these CC standards for grades 2 and 3: Number & Operations in Base Ten
2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
3.NBT.2. Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction. This 4-page lesson includes instructions, correlation of standards, recording sheet, and "operation" cards.