Introduction to Ratios

Grade 7 Mathematics Understanding and Expressing Ratios Real-World Comparisons

Think About This...

You have 3 apples and 2 oranges to share with friends. How would you describe the comparison between apples and oranges? What if you had to explain this to someone who wasn't there?

What is a Ratio?

A ratio compares two quantities by division It shows the relationship between amounts Ratios help us understand proportions in real life Example: 3 apples to 2 oranges

Three Ways to Express Ratios

Reading Ratios Correctly

{"left":"The ratio 3:2 reads as 'three to two'\nThe first number comes before the colon\nThe second number comes after the colon","right":"Order matters! 3:2 is different from 2:3\nAlways read from left to right\nThink about what you're comparing first"}

Hands-On Practice

Work with your partner Use the colored counters provided Create the ratio 5 red to 3 blue Write it in all three forms on your worksheet Check your answer with another pair

Real-World Ratio Examples

Sports: 11 players to 1 goalkeeper in soccer Cooking: 2 cups flour to 1 cup sugar School: 25 students to 1 teacher Technology: 16:9 screen ratio on TVs Nature: 8 legs to 1 spider

Quick Check: Can You Do It?

Look at this scenario: There are 12 boys and 18 girls in our class Write the ratio of boys to girls in all three forms Remember: order matters! Take 3 minutes to solve this