3.1.2.2
Use addition and subtraction to solve real-world and mathematical problems involving whole numbers. Use various strategies, including the relationship between addition and subtraction, the use of technology, and the context of the problem to assess the reasonableness of results.
Khan Academy ResourcesAdd within 1000Subtract within 1000Select strategies for subtracting within 1000Break apart 3-digit subtraction problemsAdd and subtract within 1000 word problems2-step word problemsFind the missing number (add and subtract within 1000)Subtraction by breaking apartAdding 3-digit numbersSubtracting 3-digit numbers (regrouping) Worked example: Subtracting 3-digit numbers (regrouping twice)Worked example: Subtracting 3-digit numbers (regrouping from 0)Methods for subtracting 3-digit numbers2-step word problem: runningThree digit addition word problemsWorked example: Subtracting 3-digit numbers (regrouping) Three digit subtraction word problemsMissing number for 3-digit subtraction within 1000Missing number for 3-digit addition within 1000

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