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.7
- Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.