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.
Write an equation to describe this situation:
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.
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