Understanding Percent Proportions and Calculations

The video tutorial covers lesson 3.2 on connecting percents and proportions. It begins with defining a percent proportion as an equation where a percent equals an equivalent ratio. The tutorial includes examples of using percent proportions to find unknown values, such as calculating 2% of 180, determining what percent 17 is of 40, and solving real-world problems like population increase and house down payment percentages. The lesson concludes with a recap of the key concepts and methods discussed.

What is a percent proportion?

• An equation where a percent is equal to a whole number

• An equation where a percent is equal to a fraction

• An equation where a percent is equal to an equivalent ratio

• An equation where a percent is equal to a decimal

How can we use a percent proportion?

• To find unknown parts, wholes, or percents

• To find only unknown percents

• To find only unknown wholes

• To find only unknown parts

What is the first step in writing a percent proportion?

• Write the percentage as a fraction on one side

• Write the decimal equivalent on one side

• Write the unknown value on one side

• Write the whole number on one side

How do you solve a percent proportion problem?

• By cross multiplying

• By dividing the numbers

• By subtracting the numbers

• By adding the numbers

What is 2% of 180?

• 3.6

• 36

• 18

• 0.36

What percent is 17 out of 40?

• 42.5%

• 40%

• 35%

• 45%

How do you find the percent of a number using a calculator?

• Divide the part by the whole and multiply by 100

• Multiply the part by the whole and divide by 100

• Add the part and the whole and multiply by 100

• Subtract the part from the whole and divide by 100

If a population increases by 200%, what does this mean?

• The population is half the original

• The population is the same as the original

• The population is twice the original

• The population is three times the original

How many rabbits were there last year if there are 1100 this year and the population increased by 200%?

• 275

• 2200

• 1100

• 550

What percentage of the house price is a $60,000 down payment on a $240,000 house?

• 20%

• 25%

• 30%

• 15%