3.N.2.5
Use addition and subtraction to solve problems involving whole numbers. Use various strategies, including the relationship between addition and subtraction and the context of the problem to assess the reasonableness of results.
Khan Academy ResourcesSelect strategies for subtracting within 1000Add and subtract within 1000 word problems2-step word problemsFind the missing number (add and subtract within 1000)Adding and subtracting on number line word problems2-step word problem: runningThree digit addition word problemsThree digit subtraction word problemsMissing number for 3-digit addition within 1000

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