Grade 2 - Number and Operations in Base Ten
Standard 2.NBT.B.7 - Simplify both sides of the equation and find the missing number that makes the equation true.
Included Skills: Subtraction
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.