Expression - Definition with Examples
What is an expression?
An algebraic expression can be represented as:
The parts of an algebraic expression can be described as:
- Variable - A variable is represented by an alphabet such as x, y or z, in an algebraic expression.The value of the variable varies basis the coefficients and constants in the expression.
- Constant - A constant can be a whole number, a decimal number or any fraction that has no variable attached to it. It stands alone in an algebraic expression.
- Coefficient - A coefficient of any variable is a number attached to a variable. If the variable exists without a coefficient, then its coefficient is 1.
- Terms - Terms are the values on which the mathematical operations take place in an expression. A term can be a constant or a variable or both in an expression.
Examples of algebraic expressions are 3a + 8, 9x − 6y, 7pq², .
When changing verbal phrases and sentences into expressions, look for words that indicate operations and assign a meaningful variable to represent what is to be calculated.
|Verbal phrase/sentence||Algebraic Expression|
|Five added to four times of a number||5 + 4x|
|Two times a number reduced by 9||2y − 9|
|Twice a number subtracted from 8||8 − 2z|
|Sum of 8 and a number divided by 4||(8 + t) / 4|
Let's do it!
You can ask your child to follow a recipe and form expressions for computing the increased or decreased quantity of ingredients required as per the number of people.
Related math vocabulary
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