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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.

### 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
• 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