Series Math Routines with Kristin Gray: Second Grade: Addition Number Talk: Second Grade
Common core State Standards
- Math: Math
- 2: Grade 2
- NBT: Number & Operations in Base Ten
- B: Use place value understanding and properties of operations to add and subtract
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.
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A number string is a series of mathematical expressions organized in a way that encourages students to build on their thinking as the string progresses.