For more information, please see full course syllabus of Pre Algebra

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For more information, please see full course syllabus of Pre Algebra

For more information, please see full course syllabus of Pre Algebra

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### Writing Expressions

- In order to translate a word phrase into an algebraic expression, you translate the words into numbers and operation symbols.

Operation | Key Words |

Addition | sum, add, plus, increased by, more than |

Subtraction | difference, subtract, minus, decreased by, less than |

Multiplication | product, multiplied by, times |

Division | quotient, divided by |

### Writing Expressions

Duy is twice as old as his sister. Write an expression using Duy's age, D, to describe his sister's age, S.

- Let D = Duy's age. Let S = his sister's age.

D = 2S

A kiwi costs 95 more cents than a lemon. Write an expression using the cost of the kiwi, K, to describe the cost of the lemon, L.

- Let K = cost of the kiwi. Let L = the cost of the lemon.

K = L + 95

David's age is three times 7 less than Michelle's age. Write an expression describing David's age, D, in relation to Michelle's, M.

- Let D = David's age . Let M = Michelle's age.

D = 3(M − 7)

Write an expression for the number of months in x years.

- In 1 year, there are 12 months.
- In x years, there are 12x months.

12x

Write an expression for the number of hours in y days.

- In 1 day, there are 24 hours.
- In y days, there are 24y hours.

4y

Write an expression for the number of seconds in z minutes.

- In 1 minute, there are 60 seconds.
- In z minutes, there are 60z seconds.

60z

Tiffany buys apples for her 9 siblings. They decide to split the number of apples equally. If A = number of apples Tiffany bought, how many apples do each of her siblings get?

- Let A = total number of apples.
- There are 9 siblings, so each sibling gets [A/9] apples.

[A/9] apples

Eric bought granola bars for his 4 coworkers and gives each coworker an equal amount of granola bars. If g = number of granola bars Eric got, how many granola bars did each coworker receive?

- Let g = number of granola bars.
- There are 4 coworkers, so each coworker gets [g/4] granola bars.

[g/4] granola bars

Write an expression for the number of dogs, d, plus 7 cats.

d + 7

Write an expression for the number of m men minus 11 women.

m − 11

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.

Answer

### Writing Expressions

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

- Intro 0:00
- What You'll Learn and Why 0:05
- Topics Overview
- Vocabulary 0:15
- Addition
- Subtraction
- Multiplication
- Division
- Translating Words to Expressions 3:02
- Example: 9 Less than Twice a Number
- Writing an Algebraic Expression 3:58
- Example: Cost of Bowling
- Extra Example 1: Writing Expressions 5:14
- Extra Example 2: Writing Expressions 6:06
- Extra Example 3: Writing Expressions 7:11
- Extra Example 4: Writing Expressions 7:58

0 answers

Post by Amanda Rimeikis on March 21, 2015

Will educator.com soon be able tto connect with chrome cast?

0 answers

Post by Professor Fung on July 23, 2014

The answer should be, "24y."

0 answers

Post by Dan Brandenburg on July 19, 2014

Q. Write an expression for the number of hours in y days.

You have the answer as 4y....should be 24y, right?

0 answers

Post by Kendal Coombs on December 22, 2013

Write an expression for the number of hours in y days. when you click answer it says 4y. using your method it came out to be 24y. why did you put 4y?

0 answers

Post by Mark Andrews on August 16, 2013

Write an expression for the number of days in w weeks.

I was wondering if it would be better to write a statement that 7d = 1w to quantify how many days there are in the week. Then have the coefficient for W describing how many weeks there are.

2 answers

Last reply by: Professor Fung

Thu Jul 11, 2013 5:47 AM

Post by Giliana Levis on April 15, 2013

The practice question (5) about the hours and days's answer is wrong.

It's 24y isn't it?

0 answers

Post by Professor Fung on September 14, 2012

it is: 75 + 2(m-30) if m is greater than or equal 30

0 answers

Post by michelle morris on September 13, 2012

I have a question? on my math paper it says a plumber charges $75 for the first 30 minutes of each house call plus $2 for each additional minute that she works. ( we have to translate word problems for math)

1 answer

Last reply by: Professor Fung

Fri Sep 14, 2012 12:11 PM

Post by Jesse Ogwal on July 24, 2012

If you notice, she mad a spelling mistake on Extra Example III. :)