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.

Front

Evaluate the expression: 9y ÷ (2x + 1) when x=7 and y=15.

Back

9.

Front

Evaluate the expression: 7a + 8b × 2 when a=3 and b=4.

Back

85.

Front

Evaluate the expression: ab + 7 × 11 when a=3 and b=4.

Back

89.

Front

Evaluate the expression: ab ÷ 3 when a=3 and b=4.

Back

4.

Front

Evaluate the expression: 4b - 5a when a=3 and b=4.

Back

1.

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). This is 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.

Front

What is a coefficient in an expression?

Back

A coefficient is a numerical factor that multiplies a variable in an expression.