The temperature in Denver was −6 degrees at lunchtime. By sunset the temperature had dropped to −15 degrees. What was the difference in the lunchtime and sunset temperatures?

Question

1. Read the problem,

steps results

important values.	Got it?  Yes or  No
2. Identify what you are asked to find.
3. Write a word phrase you will use	to find it.
4. Translate the phrase into an expression.
5. Simplify the expression.
6. Answer the question

Answer 1

The answer is -9 degrees. It's important to include the negative sign because the temperature dropped.

The math: Lunchtime temperature, -6, minus 9 degrees (the temperature dropped), equals -15 degrees.

-6 - 9 = -15

The problem does not say if units are Fahrenheit or Celsius. 

More: This problem is very simple but word problems can be more difficult and complex. One way to make word problems easier is to restate the problem, with notes if possible, in your own words.

Math represents real life. Try to envision yourself in the problem or listening to someone share an experience. Word problems are much easier when you understand what the math represents in the real world, in your own words.

Example:

I visited Denver in the winter. It was cold when I went out for lunch. I heard someone say "at lunchtime it was -6 degrees." When I went out for an early dinner it was much colder. I felt it on my face and my feet, and later found out that by sunset the temperature had dropped to −15 degrees.   

What was the difference in the lunchtime and sunset temperatures?

Start at negative 6 degrees and count down (colder), -7, -8, -9, -10, -11, -12, -13, -14, -15. -15 degrees at sunset. That's 9 degrees cold, -9.