1.2
Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20 by using concrete objects, drawings, or 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.

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