Unit 3, Lesson 2
Addition and Subtraction Situations
Grade 3
Warm-up
What do you notice? What do you wonder?
Activity 1
Solve each problem. Explain or show your reasoning.
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Iguazu Falls (ee-gwah-SOO fawlz) in South America marks the border between Brazil and Argentina. It is the largest waterfall system in the world.
The system has more than one drop. Suppose the water falls 115 feet down the first drop and 131 feet down the next drop. How far would the water fall altogether?
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In Washington, D.C., there are many monuments that honor important people in American history.
The Lincoln Memorial is 99 feet tall. The Washington Monument is 555 feet tall.
How much taller is the Washington Monument than the Lincoln Memorial?
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The Eiffel Tower (AYE-fuhl TAOW-ur) in Paris, France, has 674 steps that go from the ground to the second floor. There are 327 steps from the ground to the first floor.
How many steps are there from the first floor to the second floor?