# Online Algebra Tutoring: Variable Expressions

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## Learn Variable Expressions from Certified Online Algebra Tutor

A **variable** is a symbol or an alphabetical letter used to represent an unknown number in an expression or an equation. The value of this number can vary. A variable expression is a **math expression** that consists of variables, numbers and operations **(like add,subtract, multiply, and divide)**

To translate verbal phrases into variable expressions. Look for key words that indicate **addition**, **subtraction**, **multiplication**, **division**.

### Key Words:

**Addition:** plus, the sum of, increased by, total, more than, added to.

**Subtraction:** minus, the difference of, decreased by, fewer than, less than, subtracted from.

**Multiplication:** times, the product of, multiplied by, of.

**Division:** divided by, the quotient of.

### Let’s understand with an example

The product of two and a number increased by nineteen.

The product of two and a number increased by nineteen. (LOOK FOR KEYWORDS)

**Product of** indicates multiplication

**Increased by** indicates addition

To write variable expression, assign a variable to represent the unknown number. You can take any alphabetical letter of your choice!

**The product of two and a number increased by nineteen.**

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## Check Point

**Directions: Choose the algebraic expression that correctly represents the phrase provided. Select your answer.**

- Twenty less than twice a number

**20 – 2x****2x+20****2x – 20****None of the above**

- Three times a number increased by sixteen

**3(a + 16)****3a + 16****(16 + 3)a****None of the above.**

- The product of eight and a number decreased by five.

**8(m – 5)****5(8 – m)****8m – 5****None of the above**

- Sixty divided by nine times a number

**60 + 9n****9n/60****60/9n****None of the above**

- Sarah earns $10 a day working part time at a supermarket. Write a variable expression to represent the amount of money she will earn in p days.

**10p****10/p****10 + p****None of the above**

##### Answer Key

**2x -20****3a +16****8m-5****60/9n****10p**

## Personalized Online Tutoring from eTutorWorld

eTutorWorld offers affordable one-on-one live tutoring over the web for Grades K-12, Test Prep help for Standardized tests like SCAT, CogAT, MAP, SSAT, SAT, ACT, ISEE and AP. You may schedule online tutoring lessons at your personal scheduled times, all with a Money-Back Guarantee. The first one-on-one online tutoring lesson is always FREE, no purchase obligation, no credit card required.

For answers/solutions to any question or to learn concepts, take a **FREE TRIAL **Session.

*No credit card required, no obligation to purchase. *

*Just schedule a FREE Sessions to meet a tutor and get help on any topic you want!*

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## Pricing for Online Tutoring

Tutoring Package | Validity | Grade (1-12), College |
---|---|---|

5 sessions | 1 Month | $124 |

1 session | 1 Month | $25 |

10 sessions | 3 months | $239 |

15 sessions | 3 months | $354 |

20 sessions | 4 months | $449 |

50 sessions | 6 months | $1049 |

100 sessions | 12 months | $2049 |