Writing Expressions

1. Writing Expressions

2. We need to translate words in mathematical symbols. Here are some words you should know.

3. Translate these verbal phrases into expressions… • 4 Less than the quantity 6 times a number n. • 3 times the sum of 7 and a number y. • The difference of 22 and the square of a number m. • The quotient when the quantity 10 plus a number x is divided by 2

4. Let’s try it with a word problem… • A piece of ribbon L feet long is cut from a ribbon 8 feet long. Write an expression for the length (in feet) of the remaining piece.

5. Let’s try another… • You work with 5 other people at an ice cream stand. All the worker put their tips into a jar and share the amount in the jar equally a the end of the day. Write an expression for each person’s share (in dollars) for the tips.

6. Let’s Talk About Rate

7. Here’s some vocab… • Rate • Is a fraction that compares 2 quantities measured in different units. • Unit Rate • When the denominator of the fraction is 1 unit.

8. Here’s an example of a problem involving rate… A car travels 110 miles in 2 hours. Find the unit rate. The unit rate is 55 miles per hour, or 55mi/h, or 55mph

9. Here’s one for you to try… • Your basic monthly charge for cell phone service is $30, which includes 300 free minutes. You pay a fee for each extra minute you use. One month you paid $3.75 for 15 extra minutes. Find your total bill if you use 22 extra minutes.