Grade 2 - Number and Operations in Base Ten
Standard 2.NBT.7 - Make a specific number by regrouping tens and ones.
Included Skills: Number Properties
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.