Evaluate Expressions

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operators (such as +, -, *, /) that represents a value.

Front

What does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with given numbers and performing the operations.

Front

Evaluate the expression: 5z - 20 ÷ 2 + z for z = 8.

Back

38

Front

Evaluate the expression: 4h + 2g + 4 for g = 3 and h = 9.

Back

46

Front

Back

-59

Front

Evaluate the expression: 8 + 2g - g ÷ 2 for g = 4.

Back

14

Front

Evaluate the expression: 8y + 12 - 2z for y = 4 and z = 2.

Back

40

Front

What is the order of operations in mathematics?

Back

The order of operations is a set of rules that determines the sequence in which calculations are performed: Parentheses, Exponents, Multiplication and Division (from left to right), Addition and Subtraction (from left to right) - often remembered by the acronym PEMDAS.

Front

What is a variable in an expression?

Back

A variable is a symbol (usually a letter) that represents an unknown value in an expression or equation.

Front

What is the difference between an expression and an equation?

Back

An expression is a mathematical phrase that can contain numbers, variables, and operators, but does not have an equality sign. An equation is a statement that two expressions are equal, indicated by an equality sign.