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Definition--Ratios, Proportions, and Percents Concepts--Percent of an Unknown
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Algebra >> Ratios, Proportions, and Percents >> Percents

Definition--Ratios, Proportions, and Percents Concepts--Percent of an Unknown

Percent of an Unknown

Percent of an Unknown Image

Topic

Ratios, Proportions, and Percents

Definition

Percent of an unknown refers to solving for an unknown quantity when given a percentage of that quantity.

Description

Knowing how to find a percentage of an unknown variable is essential for solving equations in algebra. This concept appears in various situations, such as when determining discounts or portions of a total amount.

For instance, if 20% of an unknown number equals 15, you can set up the equation: 

0.20x = 15

leading to a solution of x = 75. Understanding this helps students tackle various mathematical problems effectively and apply math in everyday scenarios.

Teacher's Script: "Suppose 20% of the number of marbles in a bag is equal to 9. You can write this equation to solve for x: 0.20x = 9. To find x, divide 9 by 0.2, which equals 45. So, there are 45 marbles in the bag."

Percent of an Unknown

For a complete collection of terms related to Ratios, Proportions, and Percents click on this link: Ratios, Proportions, and Percents Collection.

Common Core Standards CCSS.MATH.CONTENT.6.RP.A.1, CCSS.MATH.CONTENT.6.RP.A.2, CCSS.MATH.CONTENT.6.RP.A.3, CCSS.MATH.CONTENT.7.RP.A.3, CCSS.MATH.CONTENT.HSG.SRT.A.1.B
Grade Range 6 - 8
Curriculum Nodes Algebra
    • Ratios, Proportions, and Percents
        • Percents
Copyright Year 2021
Keywords ratios, Percent, definitions, glossary terms, rates, proportions