Practice Variables in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A symbol (usually a letter like x) that represents an unknown or changing quantity in a mathematical expression.
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.'