Finding Percent Given Part and Whole

Front

What is the formula to find the percentage of a part compared to a whole?

Back

Percentage = (Part / Whole) × 100

Front

If there are 25 students in a class and 15 are boys, how many are girls?

Back

10 girls (25 - 15 = 10)

Front

What percent of 25 is 10?

Back

40% (10 / 25 × 100 = 40%)

Front

If Sally got 22 questions wrong on a 40-question quiz, how many did she get right?

Back

18 questions (40 - 22 = 18)

Front

What is the percentage of questions Sally got right?

Back

45% (18 / 40 × 100 = 45%)

Front

If 29 out of 50 students passed a test, what percent passed?

Back

58% (29 / 50 × 100 = 58%)

Front

What does the word 'of' usually mean in percentage problems?

Back

Multiply

Front

What percent of 50 is 20?

Back

40% (20 / 50 × 100 = 40%)

Front

How do you convert a fraction to a percentage?

Back

Multiply the fraction by 100.

Front

If a store sells 80 items and 20 are on sale, what percent are on sale?

Back

25% (20 / 80 × 100 = 25%)