Finding the Whole from Percent and Part

What is the formula used to find the whole given the percent and part?

• is/percent = of/100

• is/percent = part/100

• is/of = percent/100

• is/part = percent/100

In the first example, what is the whole number if 12 is 20%?

• 80

• 70

• 60

• 50

What is the relationship between 20% and 100% in the first example?

• 20% is half of 100%

• 20% is one-fifth of 100%

• 20% is one-fourth of 100%

• 20% is one-sixth of 100%

In the second example, what is the whole number if 15 is 60%?

• 25

• 35

• 30

• 20

What is the relationship between 60% and 100% in the second example?

• 60% is one-third of 100%

• 60% is two-thirds of 100%

• 60% is half of 100%

• 60% is three-fifths of 100%

In the third example, what is the whole number if 150 is 30%?

• 550

• 500

• 450

• 400

What is the relationship between 30% and 100% in the third example?

• 30% is one-sixth of 100%

• 30% is one-fourth of 100%

• 30% is one-fifth of 100%

• 30% is one-third of 100%

In the fourth example, what is the total number of students if 10 girls make up 40%?

• 20

• 25

• 30

• 35

What is the relationship between 40% and 100% in the fourth example?

• 40% is one-third of 100%

• 40% is one-fourth of 100%

• 40% is two-fifths of 100%

• 40% is three-fifths of 100%

What is the purpose of using cross multiplication in these examples?

• To find the percent

• To find the part

• To find the ratio

• To find the whole