Practice Variables in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
Symbols (usually letters) that represent unknown or changing quantities in mathematical expressions and equations.
Like a box that can hold any number. 'x + 5 = 12' asks: what's in the box?
Example 1
easyIf x + 5 = 12, what value does x represent?
Example 2
mediumEvaluate the expression 3x + 2y when x = 4 and y = -1.
Example 3
easyIf 2n = 18, what is the value of n?
Example 4
mediumWrite an expression using a variable for: 'a number increased by 8.'