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21 st Century Lessons

Teach students how to understand and compare quantities using ratios. Engage with hands-on activities, practice problems, and assessments.

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21 st Century Lessons

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  1. 21st Century Lessons Introduction to Ratios Primary Lesson Designer(s): Stephanie Conklin

  2. This project is funded by the American Federation of Teachers.

  3. Agenda: OBJECTIVE: Students will demonstrate and understanding of ratios concretely, pictorially, and symbolically . What does the word quantity mean? 1) Warm Up – Talk and Turn 2) Lucky Charms Launch – Whole Class 3) Exploration - Partner Hint: How many ears do I have? 4) Summary - Individual 5) Practice – Small Group 6) Assessment - Individual A quantity is an amount of anything that we can count. Like my ears!

  4. Lucky Charms Launch Turn and Talk: • Have you ever had Lucky Charms cereal? • Are there more marshmallows or oat pieces in a box of Lucky Charms? • Predict how many marshmallows pieces are 1 box. • Predict how many oat pieces are in 1 box. Hint: Agenda

  5. Lucky Charms Continued  There are 287 marshmallow pieces and 2,583 Oat Pieces in 1 box of Lucky Charms. We can write this real-world situation as a ratio! A ratio is a comparison of two different quantities. We can write a ratio in 3 ways using: 1) a fraction 2) the word, “to” 3) a colon : Agenda

  6. Lucky Charms Continued Write the ratio of marshmallows to oats in 3 ways. Remember in 1 box: 287 Marshmallows 2,583 Oats Let’s try together: 1) A Fraction 2) The Word “to 287 Marshmallows to 2,583 Oats 3) A Colon 287 Marshmallows : 2,583 Oats Agenda

  7. Practice – Work with a partner! Write a ratio comparing # of people to # of pizzas for each picture. Picture #1 Picture #2 1 person: 4 pizzas 4 people: 1 pizza • Talk to your partner • How are the ratios above alike? • Does the order matter when writing a ratio? Yes! The situation changes if we change the order of pizza & people.! Agenda

  8. Explore lions to birds 6 lions to 1 bird lions : birds 6 lions : 1 bird Partner Work: Use the picture above to write a ratio in 3 ways comparing the # of lions to # of birds. Agenda

  9. Simplifying Ratios • Write in simplest form the ratio of Biking to Running. • Let’s explain the meaning of this ratio! • This ratio means that for every 1 hour biking, Christian spent ___ hours • playing basketball. Agenda

  10. Simplifying Ratios • Write in simplest form the ratio of Christian’s time spent running to total hours of activities. • Let’s explain the meaning of this ratio! • This ratio means that for every 25 total hours Christian spent on activities, he spent ____ hours running. Scaffold Agenda

  11. Summary – Try Independently • A ratio is a comparison of two different _________. • We can write a ratio in ____ different ways. • Ratios can be written as •  As a fraction • Using the word “to” • Using a colon : Agenda

  12. Practice Use the CW hand-out to complete the following problems. Agenda

  13. Practice Use the CW hand-out to complete the following problems. Agenda

  14. Practice - Answers Agenda

  15. Practice - Answers Agenda

  16. Assessment Complete the following questions on your own! Write a ratio comparing # of fish to # of sharks in 3 ways. Agenda

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