Ratios & Proportions

1.0x

Ratios & Proportions

Created 2 years ago

Duration 0:12:46
lesson view count 188
Select the file type you wish to download
Slide Content
  1. Ratios & Proportions

    Slide 1 - Ratios & Proportions

    • Solving Proportions with algebra
  2. Ratios & Unit rates

    Slide 2 - Ratios & Unit rates

  3. A ratio compares two quantities

    Slide 3 - A ratio compares two quantities

    • Brownie Recipe
    • 1⁄2 cup vegetable oil
    • 1 cup sugar
    • 1 teaspoon vanilla
    • 2 large eggs
    • 1⁄4 teaspoon baking powder
    • 1⁄3 cup cocoa powder
    • 1⁄4 teaspoon salt
    • 2 cup flour
    • What is the ratio of flour to sugar?
  4. Brownie Recipe

    Slide 4 - Brownie Recipe

    • 1⁄2 cup vegetable oil
    • 1 cup sugar
    • 1 teaspoon vanilla
    • 2 large eggs
    • 1⁄4 teaspoon baking powder
    • 1⁄3 cup cocoa powder
    • 1⁄4 teaspoon salt
    • 2 cup flour
  5. When we scale up a ratio, it creates an equivalent ratio

    Slide 5 - When we scale up a ratio, it creates an equivalent ratio

    • Single Brownie Recipe
    • 1⁄2 cup vegetable oil
    • 1 cup sugar
    • 1 teaspoon vanilla
    • 2 large eggs
    • 1⁄4 teaspoon baking powder
    • 1⁄3 cup cocoa powder
    • 1⁄4 teaspoon salt
    • 2 cup flour
    • Double Brownie Recipe
    • 1 cup vegetable oil
    • 2 cup sugar
    • 2 teaspoon vanilla
    • 4 large eggs
    • 1⁄2 teaspoon baking powder
    • 2⁄3 cup cocoa powder
    • 1⁄2 teaspoon salt
    • 4 cup flour
    • X 2 =
  6. A unit rate can be useful when comparing two ratios

    Slide 7 - A unit rate can be useful when comparing two ratios

    • To find the unit rate, write the two quantities as a ratio and simplify so that the denominator is one. [Divide the top by the bottom].
    • A 5lb bag of flour is $2.29. A 12lb bag of flour is $5.90. Which bag has a lower price per pound?
  7. This unit will use the skill of dividing decimals. Please practice this skill before beginning.

    Slide 9 - This unit will use the skill of dividing decimals. Please practice this skill before beginning.

    • www.khanacademy.org/math/cc-fifth-grade-math/cc-5th-arith-operations/cc-5th-dividing-decimals/e/dividing_decimals_3
  8. Proportions

    Slide 10 - Proportions

  9. Two equivalent ratios can be written as a proportion

    Slide 11 - Two equivalent ratios can be written as a proportion

    • Single Brownie Recipe
    • 1 cup sugar
    • 2 cup flour
    • Double Brownie Recipe
    • 2 cup sugar
    • 4 cup flour
    • X 2 =
  10. A proportion can be solved using mental math

    Slide 13 - A proportion can be solved using mental math

    • Single Brownie Recipe
    • 1⁄2 cup vegetable oil
    • 1 cup sugar
    • 1 teaspoon vanilla
    • 2 large eggs
    • 1⁄4 teaspoon baking powder
    • 1⁄3 cup cocoa powder
    • 1⁄4 teaspoon salt
    • 2 cup flour
    • If we scaled this recipe up to make three servings, how much sugar would you need when using 6 cups of flour?
  11. A proportion can be solved using Algebra

    Slide 15 - A proportion can be solved using Algebra

    • To solve a proportion using algebra, take the cross-product and simplify.