Percent

Review According to the recipe, it takes 2 cups of sugar to make 36 cookies. How many cups of sugar is need to make 90 cookies?

Objectives As a learner, I will… Write percents as decimals and fractions

What do you already know about PERCENT?

Here’s a question for you… What words do you know that contain “cent”?

Brain Pop: Percents

Key Concept: Modeling Percents 1) 30% 2) 55% 3) 15%

Vocabulary Percent – a ratio comparing a number to 100 “per” – means “of” “cent” – means “100”

Key Concept: Writing Percents as Fractions To write a percent as a fraction: Write the percent as the numerator Write 100 as the denominator Simplify

Key Concept: Writing Percents as Fractions Example: Write 35% as a fraction in simplest form.

Key Concept: Writing Percents as Fractions Example: Up to 55% of the heat lost by your body can be lost through your head. Write 55% as a fraction in simplest form.

Key Concept: Writing Percents as Fractions You try… Example: Write 44% as a fraction in simplest form.

Key Concept: Writing Percents as Decimals To write a percent as a decimal: Move the decimal 2 places to the left Add the decimal and zero

Key Concept: Writing Percents as Decimals Example: Write 35% as a decimal.

Key Concept: Writing Percents as Decimals Example: The water frozen in glaciers makes up almost 75% of the world’s fresh water supply. Write 75% as a decimal.

Key Concept: Writing Percents as Decimals You try… Example: Write 72% as a decimal.

Key Concept: Writing Decimals as Percents To write a decimal as a percent: Move the decimal two places to the right Add a % to the end

Key Concept: Writing Decimals as Percents Example: Write 0.35 as a percent.

Key Concept: Writing Decimals as Percents You try… Example: Write 0.72 as a percent.

Key Concept: Writing Fractions as Percents To write a fraction as a percent: Write an equivalent fraction with a denominator of 100 Write the numerator with a percent symbol or Divide the numerator by the denominator Multiply by 100 by moving the decimal point to the right two places Add a % to the end

Key Concept: Writing Fractions as Percents Example: Write 9/25 as a percent.

Key Concept: Writing Fractions as Percents You try… Example: Write 1/8 as a percent.