This twenty-nine page packet analyzes the common core math standard 2.NBT.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).
Ten Lessons on Adding Three-Digit Numbers
Ten Lessons on Subtracting Three-Digit Numbers
Six Lessons on Adding and Subtracting Three-Digit Numbers
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