Arithmetic Grade Three

Lesson One hundred seventy-two: Word Problems

Here's another example: 


	At sunset the temperature is 66 degrees.
	The temperature goes down by 20 degrees
	by midnight. What is the temperature at 
	midnight?
In this problem we start with 66 and then we go down by 20 degrees. This is clearly a subtraction problem: 

	66 - 22 = 38

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