Grade 2 · Number and Operations in Base Ten

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.

Read this standard on the official Common Core site

Lessons that teach this standard

• Adding and Subtracting Within 1,000

  Grade 2: add and subtract three-digit numbers — hundreds with hundreds, tens with tens, ones with ones — making or breaking tens and hundreds, and write it in columns.