PPT-Ratios and Proportions

Outline Ratios What is a Ratio How to Use Ratios How to Simplify Proportions What is a proportion Properties of proportions How to use proportions Mysterious Problems. Ratios ratios are one number expressed in relation to another by dividing the one number by the other For example the sex ratio of Delaware in 1990 was 343200 females to 322968 males or 106 This can easily be expressed in terms of males to females 9 5. : Ratios, Rates & Proportions . Section . 4. Solving Proportions. California Standards. Number Sense 1.2: Interpret and use ratios in different contexts.. Number Sense 1.3: Use proportions to solve problems. Use Cross-Multiplication as a method for solving such problems.. An introduction. Ratios express . relationships. 1 dozen eggs . $2.50. 2 cups of flour. 1 cake. This expresses the relationship that 1 dozen eggs cost $2.50. . This expresses the relationship that 2 cups of flour are needed to make 1 cake. In this section we will be able to give real life examples of Fractions and Proportions. We will also learn how to solve and evaluate Fractions and Proportions in word problems.. Lesson plan goals. We are constantly using fractions everyday. Most of the time not really even noticing that we are using fractions. Have you ever checked the clock or a watch for the time? Guess what the time is a fraction of a day so any time you use a watch, clock. Remember to Silence Your Cell . Phone and Put It In Your Bag!. Proportional Variance. Two quantities . vary proportionally. iff as their corresponding values increase or decrease, the ratios of the two quantities are always equivalent.. UNIT 6. Math 7 Plus. So far we have looked at the following ways to use ratios to find unit rates as well as to help us find other equivalent ratios. . GRAPHING IN A COORDINATE PLANE. Best used to make predictions about equivalent ratios. Reduce or Enlarge. When looking at pictures, sometimes they must be reduced or enlarged to fit a certain purpose. In the example below, the picture on the right is the original. The picture on the left needed to be resized in order to fit on a flyer. 3/28/17. How do we write ratios?. How do we write and simplify rates?. How do we decide whether two ratios/rates are proportional?. Today We’ll Discuss. Definition:. The . ratio. of two numbers . Lesson 5.2: Proportions. Chapter Five: Ratios and Proportions. Lesson 5.2: Proportions. Chapter Five: Ratios and Proportions. Lesson 5.2: Proportions. Chapter Five: Ratios and Proportions. Lesson 5.2: Proportions. two-proportion inference tests. Chapter 22. Proportions observed in independent random samples . are. independent. Thus, we can add their variances. So…. The standard deviation of the difference between two sample proportions is . John Barker & Jennifer Thomas. Nevada Math Project. March 2015. Big Ideas. Ratio – A ratio is used to measure two different things in two different units.. Ex. How far a car drives with how long it takes to get to the destination. . Difference Between Proportions. Sometimes we want to see if there is a significant difference between independent groups.. Control group vs. treatment group or placebo group. Men vs. women. Last year vs. this year. RATIOS. A . ratio. compares the magnitude (size) of two quantities. There are two types of ratios: part-part and part-whole.. RATIOS. A . ratio. compares the magnitude (size) of two quantities. There are two types of ratios: part-part and part-whole.. Proportion – Learning Outcomes Express quantities as proportions of each other using fractions, decimals, ratios, and percentages. Divide quantities into a given proportion. Express errors as a proportion.