Standards

CCSS.Math.Content.2.NBT.B

Use place value understanding and properties of operations to add and subtract.

Number and Operations in Base Ten

Common Core State Standards (CCSS) Initiative: Mathematics Standards

CCSS.Math.Content.2.NBT.B.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.