standard_description: 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.
problem_activity: Problem 1
Write 500,000 + 20,000 + 6,000 + 100 + 4 in standard and word form.
Problem 2
Write three hundred forty thousand, seventy-eight in standard and expanded form.
Problem 3
Write 73,906 in word and expanded form.


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