Variables, Expressions and Equations SOL 5.19

Front

What is a variable in mathematics?

Back

A variable is a symbol, often a letter, that represents a number that can change or vary.

Front

What is an expression in mathematics?

Back

An expression is a combination of numbers, variables, and operations (like addition or multiplication) that represents a value.

Front

What is an equation?

Back

An equation is a mathematical statement that asserts the equality of two expressions, typically containing an equal sign (=).

Front

How do you solve for a variable in an equation?

Back

To solve for a variable, you isolate the variable on one side of the equation using inverse operations.

Front

What does it mean to evaluate an expression?

Back

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

Front

What is the difference between an expression and an equation?

Back

An expression does not have an equal sign and represents a value, while an equation states that two expressions are equal.

Front

What does 'n' represent in the equation 28 x n = 112?

Back

In this equation, 'n' represents the number of days it takes to read 112 pages at a rate of 28 pages per day.

Front

What is the formula to find the average?

Back

The average is found by adding all the values together and dividing by the number of values.

Front

If k represents a number, how would you express '23 times a number'?

Back

You would express it as 23 x k.

Front

What is the operation used to find how many cupcakes Chrissy has left?

Back

The operation used is subtraction: 29 - n = 12.