Practice Variable as Placeholder in Math
Use these practice problems to test your method after reviewing the concept explanation and worked examples.
Quick Recap
A variable used to represent one specific unknown number that satisfies a given equation or condition.
Like a blank in a sentence: '\_ + 3 = 7' asks 'what number fits here?'
Example 1
easyIn the equation x + 8 = 15, what specific value does x represent?
Example 2
mediumA rectangle has area 24 cm² and width 4 cm. Use a variable to find the length.
Example 3
mediumMaria has some stickers. After giving away 8, she has 15 left. Write an equation and find how many she started with.
Example 4
easyFind the value of n in 3n = 21.
Example 5
mediumI think of a number, double it, and add 5 to get 19. What is my number?