'Cross products' presentation slideshows

Measurement Activities

Measurement Activities. Virginia Standards of Learning Grade 4 SOL 4.10 a, b, c. SOL 4.10 a Estimate conversions between U.S. Customary and metric units, using ballpark comparisons: 1 ounce is about 28 grams; A paper clip weighs about 1 gram An ounce is about the weight of 10 pennies

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6.4 Parallel Lines and Proportional Parts

6.4 Parallel Lines and Proportional Parts . Objectives. Use proportional parts of triangles Divide a segment into parts. Triangle Proportionality Theorem.

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1-8

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4-1 Ratios & Proportions

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8-6 The Law of S ines and Law of Cosines

8-6 The Law of S ines and Law of Cosines. You used trigonometric ratios to solve right triangles. Use the Law of Sines to solve triangles. Use the Law of Cosines to solve triangles. Law of Sines.

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Warm Up

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Similar Figures

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Finding a Number When the Percent Is Known

Finding a Number When the Percent Is Known. 8.3. Pre-Algebra. 1. 3. 33. %. Warm Up. 1. What percent of 20 is 18? 2. What percent of 400 is 50? 3. 9 is what percent of 27? 4. 25 is what percent of 4?. 90%. 12.5%. 625%. Learn to find a number when the percent is known. 12. 60.

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7-6

7-6. Similar Figures. Warm Up. Problem of the Day. Lesson Presentation. Pre-Algebra. 7-6. Similar Figures. p 9. 3 9. y 5. 28 26. 56 35. 4 12. 56 m. b 30. =. =. =. =. Pre-Algebra. Warm Up Solve each proportion. 1. 2. b = 10. y = 8. m = 52. 3. 4. p = 3.

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Warm Up

6 10. ,. 9 15. 5 6. ,. 16 18. ,. 3 2. ,. Warm Up. Find two ratios that are equivalent to each given ratio. Possible answers:. 10 12. 20 24. 3 5. 1. 2. 45 30. 90 60. 24 27. 8 9. 3. 4. Solving Proportions. 7.4. Pre-Algebra. Learn to solve proportions.

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Warm Up Do each of these pairs make a proportion? Solve. 5x = 85 Solve. 2x = 16 Solve 9x = 15

Warm Up Do each of these pairs make a proportion? Solve. 5x = 85 Solve. 2x = 16 Solve 9x = 15. 1. 3 5. 9 15. 10 12. 15 18. 2. Yes Yes No No 17 8 15/9 = 1 6/9 = 1 2/3. 3. 45 30. 15 5. 4. 8 9. 12 13. Review Homework

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Section 9.6

Section 9.6. Rational Equations. Solving Rational Equations. ALGEBRA 2 LESSON 9-6. (For help, go to Lessons 5-8 and 9-1.). Find the LCD of each pair of fractions. 1. , 2. , 3. , 4. , 5. , 6. , . x 2. 3 x 8. 1 3 t. 1 5 t 2. 2 h h 3. 4 y + 2. 3

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5.1 Ratios, Rates, & Proportions

5.1 Ratios, Rates, & Proportions. Ratio: The ratio of 2 numbers a and b is the quotient of the numbers. The numbers a & b are referred to as the terms of the ratio. The ratio of 2 numbers a and b may be written in a variety of ways: a a to b a : b

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10. 7 Solving Rational Equations

10. 7 Solving Rational Equations. Standard: ALG. 15.0. Main Idea & Vocabulary. Today, we will solve rational equations. Like working with fractions, be sure to find a common denominator. Rational equation : an equation with one or more rational expression.

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Solving Proportions

Solving Proportions. Section 5.2. Objectives. Determine whether a proportion is true or false Solve a proportion. Objective 1: Determine whether a proportion is true or false. Objective 1. Proportions states two ratios are equal

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Proportional and Nonproportional Relationships

7 th Grade Math Lesson Objective: Students will identify proportional and nonproportional relationships. Proportional and Nonproportional Relationships. Vocabulary. Proportional Two quantities that have a constant ratio Example: Nonproportional

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Lesson 38 Ratio Problems

Lesson 38 Ratio Problems. We can solve proportions that contain an unknown by setting the cross products equal and then dividing to complete the solution. When we set the cross products equal, we say that we are cross multiplying. Solve: . Lesson 38 cont.

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Solving Percent Problems Using Proportions

45 150. n 100. Write a proportion. =. Write the cross products. 150 n = 45 ( 100 ). 150 n 150. 45(100) 150. Divide each side by 150. =. Simplify. n = 30. COURSE 2 LESSON 6-5. Solving Percent Problems Using Proportions. What percent of 150 is 45?.

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