Indiana Academic Standards
IN.2.CA. COMPUTATION AND ALGEBRAIC THINKING
2.CA.1. Add and subtract fluently within 100.
2.CA.4. Add and subtract within 1000, using models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; describe the strategy and explain the reasoning used. Understand that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones, and that sometimes it is necessary to compose or decompose tens or hundreds.