Standard
- CCSS.Math.Content.1.NBT
- Number and Operations in Base Ten
- CCSS.Math.Content.1.NBT.C
- Use place value understanding and properties of operations to add and subtract.
- CCSS.Math.Content.1.NBT.C.4
- Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, 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 and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.