Activities to Teach Students to Write Inequalities From Number Lines
![](https://dev.theedadvocate.org/wp-content/uploads/2023/05/istockphoto-1220610073-170667a.jpg)
As a math teacher, you know that inequalities are a central concept in algebra and beyond. But for some students, these mathematical expressions can be a source of confusion and frustration. Luckily, there are plenty of engaging and effective activities you can use to help your students master the art of writing inequalities from number lines. Here are some ideas to get you started:
Number Line Races:
Divide the class into pairs or small groups and give each group a large number line. Then, call out a series of numbers and inequalities (e.g., “3,” “< 5,” “> 2,” etc.). Students must work together to find the correct spot on the number line and place a marker there before the other teams. This game helps reinforce the relationship between numbers, inequalities, and their graphical representations.
Inequality Scavenger Hunt:
Hide a set of numbered cards around the classroom or school, each with an inequality written on it. Give students a list of the numbers and inequalities they need to find, and challenge them to correctly place each card on a large number line poster. This activity requires students to not only understand inequalities and number lines but also quickly solve simple addition and subtraction equations.
Roll and Notate:
Give each student a pair of dice and a blank number line. Instruct them to roll the dice and use the resulting sum or difference to write an inequality on their number line. For example, if they roll a 3 and a 6, they might write “< 9” on the line. After each round of rolling and notating, have students share their inequalities and explain why they wrote them that way.
Real-World Inequalities:
Bring in examples of real-world scenarios that involve inequalities. For instance, a job posting might require candidates to be “at least 18 years old.” Show students how to translate this requirement into an inequality (age > 18) and ask them to come up with other examples on their own. This activity helps students see the relevance of inequalities outside of the classroom and develop critical thinking skills.
Graphing Inequalities Relay:
Divide the class into two teams and give each team a set of inequality cards. On one side of the room, set up a large number line poster. One student from each team must run to the poster, correctly graph their inequality card on the line, and run back to tag the next person in their team. The first team to successfully graph all their inequalities wins. This activity is great for kinesthetic learners and encourages students to work together to solve problems.
No matter which activities you choose, remember to emphasize the connection between inequalities and number lines, and encourage students to explain their reasoning as they solve problems. With a little creativity and effort, you can help your students become confident and proficient at writing inequalities from number lines.