Evaluate Expressions with Variables

Front

What is a variable in mathematics?

Back

A symbol used to represent an unknown value, often denoted by letters like x, y, or z.

Front

What does it mean to evaluate an expression?

Back

To calculate the value of an expression by substituting variables with their given values.

Front

Evaluate the expression: r + b if r=3 and b=5.

Back

8

Front

Evaluate the expression: n/3 if n=12.

Back

4

Front

Evaluate the expression: 10 - n if n=2.

Back

8

Front

Evaluate the expression: 7 - (2g) if g=1.

Back

5

Front

Evaluate the expression: 4(f-5) if f=7.

Back

8

Front

What is the order of operations in mathematics?

Back

The rules that dictate the sequence in which calculations are performed, often remembered by the acronym PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).

Front

What is the result of multiplying a number by zero?

Back

The result is always zero.

Front

What is the difference between an expression and an equation?

Back

An expression is a combination of numbers and variables without an equality sign, while an equation states that two expressions are equal.