Our first grade team is working on interpreting the place value section of the common core and adjusting our curriculum and resources. Most of the standards are pretty straight forward but there are a few that are a little wordy; 1.NBT.4 is one of them. Here’s what it says just in case you have walked away from your CC binder for a moment, ha!
1.NBT.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 modles or drawings and strategies based on place value, properties of operations, and/or 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.
I spoke with Miss Cosby over at You Might Be a First Grader and she said they also struggled with this one.
This is the question……
Does this mean we teach first graders how to add a two digit number and carry over?
What are you doing????