3.4.A
Solve with fluency one-step and two-step problems involving addition and subtraction within 1,000 using strategies based on place value, properties of operations, and the relationship between addition and subtraction.
Khan Academy ResourcesAdd within 1000Understand the commutative property of multiplicationSelect strategies for subtracting within 1000Add and subtract within 1000 word problems2-step word problemsFind the missing number (add and subtract within 1000)Subtracting 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: runningUsing place value to add 3-digit numbers: part 1Three 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 1000Using place value to add 3-digit numbers: part 2

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