25%, 50%, and 75%

Take half to get 50%,

Take half again to get 25% (1/4),

Add them to get 75% (3/4).

By Jim Olsen, W.I.U.#P3

One quarter

Half

Three quarters

𝟐𝟓%=𝟏𝟒

𝟓𝟎%=𝟏𝟐

7

Examples:1. The fundraiser goal is $4,000. $1,000 has been raised.

What percent has been raised?

2. Julie made 24 cookies and sold 12 cookies. What percent were sold?

3. The stadium capacity is 8,000. There are 6,000 people in the stadium. The attendance is what percent of the capacity?

1000 125%

4000 4

12 150%

24 2

6000 375%

8000 4

Examples:

1. 25% of the students polled were in favor of installing a veggie vending machine. 20 students were polled. How many favored a veggie machine?

2. 50% of the budget is for gas. The budget is $60. How much is budgeted for gas?

3. The fundraiser goal is $400. 75% of the goal has been raised. How much has been raised?

1

425% of 20 = of 20 20 4 5 students

50% of $60 half of $60 $30

50% of 400 = half of 400 $200

25% of 400 = half of 200 $100

75% of 400 = 200 100 $300

Examples:

1. 25% of the students polled had their own car. 180 students were polled. How many had their own car?

2. 25% of the 18 cups of chocolate chips were used in the first batch. How many cups of chocolate chips were used in the first batch?

3. 25% of the 18,000 people living in Macon County voted for Stevenson. How many people in Macon County voted for Stevenson?

1 1 1

2 2 225% of 180 = of of 180 of 90 45 students

1 1 1

2 2 225% of 18 = of of 18 of 9 4.5 cups

1 1 1

2 2 225% of 18000 = of of 18000 of 9000 4500 people

• Note on the last three examples that the (non-zero) numbers were the same

• 18 ÷ 4 = 4.5• The answers were similar. Just

the decimal place and number of zeros changed.

• 45, 4.5, 4500.

Closing Notes

Remember

Take half to get 50% (1/2),Take half again to get 25%

(1/4),Add them to get 75% (3/4).