Finding a Percent of a Number

Slides:

Advertisements

Similar presentations

7-8 Solving Percents Problems Learn to solve problems involving percents.

Advertisements

Holt CA Course Solving Percents Problems NS1.4 Calculate given percentages of quantities and solve problems involving discounts at sales, interest.

Proportions  A proportion is an equation with a ratio on each side. It is a statement that two ratios are equal.  3 = 6 is an example of a proportion.

Writing and Solving Proportions. Proportions Proportion is an equation stating that two ratios are equivalent. Proportional are two quantities that form.

2.5 Solving Proportions Write and use ratios, rates, and unit rates. Write and solve proportions.

Using Cross Products Lesson 6-4. Cross Products When you have a proportion (two equal ratios), then you have equivalent cross products. Find the cross.

Finding a Percent of a Number Lesson 6-7. Using a Proportion Set up a proportion that uses the percent over 100. Cross multiply to write an equation.

Solving Equations Containing Percents. Percent Proportion Method Part = % Whole 100 Example: What is 25% of 20? x = 25 You are trying to find a.

Base: The number that represents the whole or 100%.

Solving Percent Problems Using Proportions

5-1 Objective: Solving proportions.

Fractions, Decimals, and Percents. Percents as Decimals To write a percent as a decimal, divide by 100 and remove the percent symbol. Example 1: 63% 63.

Converting Fractions to Decimals

Solving Percent Problems Section 6.5. Objectives Solve percent problems using the formula Solve percent problems using a proportion.

PRESENTATION 2 Percents. PERCENTS Indicates number of hundredths in a whole A decimal fraction can be expressed as a percent by moving the decimal point.

Solving Equations Containing Percents. Percent Proportion Method Part = % Whole 100 Example: What is 25% of 20? x = 25 You are trying to find a.

Percents, Fractions, and Decimals Finding a Percent of a Number Lessons 6.6 & 6.7.

Percents and Fractions. Vocabulary A percent is a ratio that compares a number to 100. It means “per 100.” 49 out of 100 is 49%.

Proportions. Proportion – two equal ratios 1 = 4 3 = = 21 a = c 8 24 b d.

Ratio, Rate, Proportion, and Percent. Ratio  Comparison of two numbers by division  Can be written three different ways 4 to 9 4 :

Find a Percentage of a Number SWBAT use the percent formula to find a percentage of a number; use a percent proportion to find a percentage of a number.

4.1 Ratio and Proportion Ratio – comparison of two numbers by division. –Can be written: a to b a : b where b ≠ 0. If a and b represent quantities measured.

Solving Proportions. 2 ways to solve proportions 1. Equivalent fractions (Old) Cross Products (New)

Chapter 9: Lesson 4: Solving Percent Problems with Proportions

Chapter 10: Lesson 4: Solving Percent Problems with Proportions

PRE-ALGEBRA. Lesson 6-7 Warm-Up PRE-ALGEBRA What is “percent of change”? How do you find the percent of increase or decrease? percent of change: percent.

Using Equations to Solve Percent Problems

Cross Products and Proportions

Lesson 4-3 Solve proportion problems by using the percent equations

  A ratio is a way to compare two quantities that are measured in the same units by using division  45 : 100 Ratio.

Percent Proportions & Equations. A percent is a ratio that compares a number to 100. A commission is a percent of the amount of your sales. A percent.

Percent Review Mrs. Leuschen Part/Whole/Percent Equations.

Holt Algebra Percents 2-8 Percents Holt Algebra 1 Lesson Quiz Lesson Quiz Lesson Presentation Lesson Presentation Warm Up Warm Up.

Ratios & Proportional Relationships. Ratios Comparison of two numbers by division. Ratios can compare parts of a whole or compare one part to the whole.

Solving a Proportion by “Cross” Multiplying

Finding a Percent of a Number

Unit 2 Percentages Percents. Unit 2 Percentages Percents.

Skills practice 9 handout (1 – 12) odd and 13 – 22 (all)

Finding a Percent of a Number

Three Types of Percent Problems

A proportion is an equation that states two ratios are equal

Proportions and Percent Equations

Lesson 5-1: Using Proportions

2-7 Solving Proportions.

Finding a Percent of a Number

The Percent Proportion

Lesson 5.2 Proportions Students will be able use cross multiply to determine if the two ratios are equivalent.

Percent Proportion TeacherTwins©2014.

Lesson 7.1 How do you write ratios and find unit rates?

Lesson 3.1 How do you solve one-step equations using subtraction, addition, division, and multiplication? Solve one-step equations by using inverse operations.

Converting Repeating Decimals to Fractions

The Percent Proportion

Objective: Understand what proportions are, setting the up and solving

Finding a Percent of a Number

Finding a Percent of a Number

Lesson 5-1 Using Proportions.

Solving Percent Problem with Equations (7.2) Proportions (7.3)

Percents Chapter 7 Section 7.5.

3.10 Using Percents To convert fractions and decimals

Lesson 5-1: Using Proportions

Chapter 5: Proportions.

The Percent Proportion

Solving Percent Problems Using Proportions

Lesson 6 Ratio’s and Proportions

5-1 Objective: Solving proportions.

Ratio A ratio is a comparison of two numbers such as a : b. Ratio:

Algebraic Equations Many relationships in chemistry can be expressed by simple algebraic equations. SOLVING an equation means rearranging The unknown quantity.

Using Cross Products Chapter 3.

Presentation transcript:

Finding a Percent of a Number MCC6.RP.3c – Find a percent of a quantity as a rate per 100; solve problems involving finding the whole, given a part and the percent.

Writing a percent as a ratio Write the percent over 100 Example: Write 15% as a ratio. 15 100

What is a proportion? A proportion is 2 equal ratios

Using a Proportion to Find the Percent of a Number Set up a proportion that uses the percent over 100. Cross multiply to write an equation. Solve the equation. To set up your proportion, think, “IS over OF equals PERCENT over 100.”

Example – What is 20% of 30? x 20 = 30 100 100x = 30(20) 100x = 600 part = 30 100 whole 100x = 30(20) 100x = 600 100 100 x 6 =

Example: What is 55% of 60?

Find the percent of a number by converting to a decimal. 1. Write the percent as a decimal. 2. Multiply

Example: What is 35% of 16? 35% converted to a decimal is .35 Multiply .35 x 16 35% of 16 is 5.6