Solving 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 variables with numbers and performing the operations.

Front

What is a variable?

Back

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

Front

What is the order of operations?

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 as PEMDAS.

Front

Evaluate the expression: n/3 + 4 if n=18.

Back

10

Front

Evaluate the expression: (23 + m) ÷ 9 if m=4.

Back

3

Front

What is the value of 5 ÷ 1³?

Back

5

Front

How many variables are in the expression: q + 4r − 18 + 2³ - 1?

Back

2 (variables q and r).

Front

What is the result of adding two numbers?

Back

The result of adding two numbers is called the sum.

Front

What is the result of subtracting one number from another?

Back

The result of subtracting one number from another is called the difference.