If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

### Course: Math (NSDC) - English>Unit 8

Lesson 2: Expressions

# Writing basic expressions with variables

Learn to write expressions with variables in math! Discover how to represent various operations like addition, subtraction, multiplication, and division using variables. Master the art of creating expressions for real-life situations, such as finding the sum of two numbers or the difference between two values. Boost your algebra skills and become a pro at handling variables!

## Want to join the conversation?

• What do you put when it says "what is the quotient of 9 and c?"
• Quotient means division. This is asking you for the division of 9 and c. Does that help?
• what does increased by mean? Is it multipilying or what?
• It means addition
If you have 3 apples and I give you 2 more, then your number of apples has increased by 2.
3 + 2 = 5
You now have 5 apples.
Hope this helps.
• ok so i got a question, 8 increased by g. Simple right? Just supposed to write that in an expression. Same as you would say m decreased by 2 is m-2. But what is 8 increased by g? Just simple adding 8+g?
• Yes. 8 + g. Everything you can do with a number (add, subtract, multiply, divide, exponentiate, etc.) you can do with a variable. It's just a number with a different name.
• Seven multiplied by x can be written as 7x. Can it also be written as x7, since multiplication is commutative?
• Yeah, nick is right. It's not incorrect, but it's going to turn heads. You'll eventually run into a teacher who won't accept it.
• This video is kind of helpful, but I still don't really get it. On one of the questions, it said, 10-3 times 2. I answered 14 because it was 10-3 is seven, then times 2, it would equal 14. But is was 4. How the heck could it be 4.
• You need to follow order of operations rules (PEMDAS). You can't start with subtraction. You need to multiply, then subtract
10-3(2) = 10-6 = 4

Hope this helps.
• how is this so post to help me with Algerbraic Expressions??
• so...actually using variables and stuff can help in future problems of algebra like finding the whole sum of variable and things
• I wonder if Sal ever gets his math answers wrong.
• Everyone makes errors, even Sal. You will see videos that have correct boxes to fix errors that he made in the original vide.
• is it possible to put the variables before the number in the equation when using multiplication.
You can write `5x` as `x5` because the commutative property of multiplication tells us that these are the same / equal. But, it is generally not written that way. It is much easier to read with the numbers in front of the variable.