M.2.1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions (e.g. by using drawings and equations with a symbol for the unknown number to represent the problem).
Example Problems
Write an equation to describe this situation:
Larry read a 400-page book.
He read at a rate of 10 pages per day for days.
Larry read a 400-page book.
He read at a rate of 10 pages per day for days.
Write an equation to describe this situation:
Simone completed a 720-lap swimming challenge.
She swam 24 laps per day for days.
Simone completed a 720-lap swimming challenge.
She swam 24 laps per day for days.
Write an equation to describe this situation:
Mia completed a 500-piece puzzle.
She worked at a rate of 25 pieces per day for days.
Mia completed a 500-piece puzzle.
She worked at a rate of 25 pieces per day for days.
Khan Academy ResourcesSolve problems with picture graphsAdd and subtract on the number line word problemsSubtraction word problems within 1002-step subtraction word problems within 100Find the missing number (add and subtract within 100)Adding up to four 2-digit numbers word problemsLength word problemsSolve problems with line plotsAdding up to four 2-digit numbers2-step addition word problems within 100Solve problems with bar graphsLength word problem (US customary)Addition word problems within 100Adding and subtracting on number line word problemsSubtraction word problem: basketballAdding multiple 2-digit numbers word problemsAdding two digit numbers on a number linePicture graphsAddition word problem: horsesLength word problemsMulti-step subtraction word problemAdding four two digit numbersMulti step addition word problemSubtraction word problem: crayonsLength word problem example (US Customary)

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