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9/16/10 Words and Math. Entry Task. Taylor orders a pizza for dinner. The 16 pieces need to be divided equally among p people. Write an algebraic expression that show how many pieces each person gets?. 16  p. Today’s Plan: -Entry Task

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slide1

9/16/10 Words and Math

Entry Task

Taylor orders a pizza for dinner. The 16 pieces need to be divided equally among p people. Write an algebraic expression that show how many pieces each person gets?

16  p

Today’s Plan:

-Entry Task

-Words and Math

-Worksheet

Learning Target:

-I will translate words into mathematical expressions, and mathematical expressions into words.

slide2

9/16/10 Words and Math

Taylor orders a pizza for dinner. The 16 pieces need to be divided equally among p people. Write an algebraic expression that show how many pieces each person gets?

16  p

Use your expression to solve the problem if she divides them equally among 4 people.

16  p , p=4

16  (4)

4

Each person gets 4 pieces.

Today’s Plan:

-Entry Task

-Words and Math

-Worksheet

Learning Target:

-I will translate words into mathematical expressions, and mathematical expressions into words.

slide3

9/16/10 Words and Math

Insert Lesson Title Here

The county fair charges an admission of $6 and then charges $2 for each ride. Write an algebraic expression to represent the total cost after r rides at the fair.

6 + 2r

Today’s Plan:

-Entry Task

-Words and Math

-Worksheet

Learning Target:

-I will translate words into mathematical expressions, and mathematical expressions into words.

slide4

Write an expression.

Then use your expression to answer the question.

C. An airplane was flying at an altitude of 20,000 feet when it began its descent at 9:00P.M. After ten minutes, it had descended f feet.

If the plane descended 8500 feet during the ten minutes, what was its altitude at 9:10?

20,000 – f

20,000 – (8500)

11,500

Evaluate for f= 8500.

The plane’s altitude at 9:10 was 11,500 feet.

slide5

Additional Example 2: Interpreting Which Operation to Use in Word Problems

A. Jared worked for h hours at the pay rate of $5 each hour. Write an expression to determine how much money Jared earned.

5h

Multiply 5 by h hours.

B. How much money will he earn if he works a total of 18 hours?

5 • (18)

90

Jared earned $90.

slide6

Try This: Example 3C

C. After Kyle took his road trip, his car had 39,857 miles on the odometer. Before the trip, his odometer read m miles less than 39,857.

If he traveled 739 miles on the trip, what was the mileage on his car before he started the trip?

39,857 – m

Subtract m miles from 39,857.

Evaluate for m = 739.

39,857 – 739

39,118

The mileage on his car before he started the trip was 39,118 miles.

slide7

Try This: Example 2

A. A taxi-cab driver charges a base fee of $2, plus an additional $0.25 per mile. Write an expression to determine the fare.

2 + .25m

$2 plus .25 per mile.

B. If a passenger needs to travel 12 miles, how much money will they need to pay?

2 + .25(12)

$5

Evaluate the expression for m =12.

It will cost $5 to travel 12 miles.

slide8

Bill’s Taxi Company charges $2 plus $0.35 for each minute.

a. Write an expression for the cost of a taxi ride of m minutes long.

b. How much will a 12 minute ride cost?

slide9

Write an algebraic expression and used it to solve the problem.

Karen buys n raffle tickets for $0.50 each. If she buys 13 of them, how much will they cost?

0.50n; $6.50

slide10

9/16/10 Words and Math

Homework

Assignment #7

Worksheet

Today’s Plan:

-Entry Task

-Words and Math

-Worksheet

Learning Target:

-I will translate words into mathematical expressions, and mathematical expressions into words.

slide11

Expression

Word Phrases

+

a

or a 7

7

  • a number plus 5
  • add 5 to a number

n + 5

  • sum of a number and 5
  • 5 more than a number
  • a number increased by 5
  • a number minus11
  • subtract 11 from a number

x11

  • difference of a number and 11
  • 11 less than a number
  • a number decreased by 11
  • 3 times a number
  • 3 multiplied by a number

3m

  • product of 3 and a number
  • a number divided by 7
  • 7 divided into a number
  • quotient of a number and 7