Proportions and Percent Equations Algebra 4-3

Percent Percent is a ratio that compares an number to 100 23% = 23 100

Solve Percent Problem Can solve a percent problem by writing and solving a proportion Percent 𝑛 100 = 𝑝𝑎𝑟𝑡 𝑤ℎ𝑜𝑙𝑒

Percents and Proportions Find % Find Part Find Whole What % of 45 is 10? What is 16% of 261? 71% of what # is 78? 𝑛 100 = 10 45 𝑝𝑎𝑟𝑡 𝑤ℎ𝑜𝑙𝑒 16 100 = 𝑤 261 𝑝𝑎𝑟𝑡 𝑤ℎ𝑜𝑙𝑒 71 100 = 87 𝑣 𝑝𝑎𝑟𝑡 𝑤ℎ𝑜𝑙𝑒

As an equation “is” means = Write percents as a decimal “% of” means multiply “is” means = Write percents as a decimal

Percents and Fractional Equivalents (You should know)