1. Unit 3 Vocabulary
expressions

2. Algebraic Expression Examples: 6x + 7, 𝑥 2 + 1
A mathematical phrase involving at least one variable and sometimes numbers and operation symbols
Algebraic expressions do not contain equal signs
Examples: 6x + 7, 𝑥

3. Arithmetic Expression
An expression that represents a numeric value.
Example: = 8

4. Associative Property
Associative property of addition (a + b) + c = a + (b + c) Associative property of multiplication (a × b) × c = a × (b × c)

5. Base
(of a power): The factor being multiplied by itself. Base → 3⁴

6. Coefficient
The number part of a term that includes a variable.

7. Commutative Property
Commutative property of addition: a + b = b + a • Commutative property of multiplication :a × b = b × a

8. Evaluate
To find the value of an expression by replacing each variable in an expression with numbers.

9. Evaluate an Algebraic Expression
To find the value of an expression by replacing each variable in an expression with numbers.

10. Exponent
The number of times a number or expression (called base) is used as a factor of repeated multiplication. Also called the power.

11. Expression
An expression is a mathematical phrase containing numbers and operation symbols.
Example: 2x + 5y, 3 𝑥

12. Like Terms
Terms that have identical variable parts. Two or more constant terms are also considered like terms.

13. Numerical Expression
An expression that contains only numbers and operations and that represents a particular value.

14. Power
A number that can be expressed using an exponent.

15. Ratio
A comparison of two quantities that have the same unit of measure.

16. Substitute
To replace one element of a mathematical equation or expression with another.

17. Term A number, a variable, or a product of numbers and variables.
Examples:
5e, m, 8x, 3ab, and -9r2s are all terms

18. Tangram
An ancient Chinese square puzzle consisting of seven pieces that can be rearranged to make various shapes.

19. Table
A means of organizing data in rows and columns for a particular purpose.

20. Variable
A letter or symbol used to represent a number or quantities that vary