Expressions with Variables

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 does it mean to evaluate an expression?

Back

To evaluate an expression means to calculate its value by substituting the variables with their given values.

Front

What is the expression for 'three times a number h'?

Back

3h

Front

If h=3, what is the value of 3h?

Back

9

Front

What is the expression for 'three times the sum of a number n and 2'?

Back

3(n + 2)

Front

If n=4, what is the value of 3(n + 2)?

Back

18

Front

What does the expression n+n+5+2n simplify to?

Back

4n + 5

Front

If n=0, what is the value of n+n+5+2n?

Back

5

Front

What is the expression for 'four times the difference of a number f and 5'?

Back

4(f - 5)

Front

If f=7, what is the value of 4(f - 5)?

Back

8