Standard
- CCSS.Math.Content.2.NBT
- Number and Operations in Base Ten
- CCSS.Math.Content.2.NBT.B
- Use place value understanding and properties of operations to add and subtract.
- CCSS.Math.Content.2.NBT.B.8
- Mentally add 10 or 100 to a given number 100-900, and mentally subtract 10 or 100 from a given number 100-900.