Lesson 16Interpreting Inequalities
Learning Goal
Let’s write inequalities.
Learning Targets
I can match an inequality to a situation it represents, solve it, and then explain what the solution means in the situation.
If I have a situation and an inequality that represents it, I can explain what the parts of the inequality mean in the situation.
Lesson Terms
- solution to an inequality
Warm Up: Solve Some Inequalities!
Problem 1
For each inequality, find the value or values of
Activity 1: Club Activities Matching
Problem 1
Choose the inequality that best matches each given situation. Explain your reasoning.
Activity 2: Club Activities Display
Problem 1
Your teacher will assign your group one of the situations from the last task. Create a visual display about your situation. In your display:
Explain what the variable and each part of the inequality represent
Write a question that can be answered by the solution to the inequality
Show how you solved the inequality
Explain what the solution means in terms of the situation
Are you ready for more?
Problem 1
How many sets of three consecutive integers are there whose sum is between 51 and 60? Can you be sure you’ve found them all? Explain or show your reasoning.
How many sets of four consecutive integers are there whose sum is between 59 and 82? Can you be sure you’ve found them all? Explain or show your reasoning.
Lesson Summary
We can represent and solve many real-world problems with inequalities. Writing the inequalities is very similar to writing equations to represent a situation. The expressions that make up the inequalities are the same as the ones we have seen in earlier lessons for equations. For inequalities, we also have to think about how expressions compare to each other, which one is bigger, and which one is smaller. Can they also be equal?
For example, a school fundraiser has a minimum target of $500. Faculty have donated $100 and there are 12 student clubs that are participating with different activities. How much money should each club raise to meet the fundraising goal? If