Part 1: Lesson Description
Learn fractions through graphing.
Using adult learning theory and real world examples, learners will use graphing to understand fractions. Learners will be able to intrepret fractions and will be able to use fractions to interact with math in the real world.
Learner Audience / Primary Users
Adult learners working on level B math skills, who already have mastered level A (CCRS).
Designers for Learning, Adult Education, Fractions, Graphing
Time Required for Lesson
- time management, travel, life
- At the end of this instruction, learners should be able to: easily utilize visual bar graph or pie graph in order to solve a math problem involving fractions.
College & Career Readiness Standards (CCRS) Alignment
The Lesson is designed to align with the following Standards:
Mathematics Level B: Understand a fraction 1/b as the quantity formed by 1 part when a whole is partitioned into b equal parts; understand a fraction a/b as the quantity formed by a parts of size 1/b. (3.NF.1)
Recognize and generate simple equivalent fractions, e.g., 1/2 = 2/4, 4/6 = 2/3. Explain why the fractions are equivalent, e.g., by using a visual fraction model. (3.NF.3b)
Compare two fractions with the same numerator or the same denominator by reasoning about their size. Recognize that comparisons are valid only when the two fractions refer to the same whole. Record the results of comparisons with the symbols >, =, or
- Learners will need to have prior knowledge of base 10 number system, addition, subtraction, and representing and interpreting data, all of which is covered in Level A.
The lesson plan is required, as well as pencil and paper for graphing.
Lesson Author & License
Author: Sarah Burgart
License: Creative Commons CC BY 4.0 license
Part 2: Lesson
Using a graph to answer questions
A graph of how I use the hours in my day.
1) How many hours do I sleep each day?
2) What does this graph measure?
3) How many total hours each day are represented in this graph?
Time: 3 mins
Define fraction with example, explain how graphing can help visualize fractions.
Time: 5 mins
"A fraction is a part of a whole. The top number is how many parts of the whole, and the bottom number is how many parts the whole is divided into."
3/4 = 3 parts of a whole divided into four parts.
1/2 = 1 part of a whole divided into two parts.
The formula for a fraction would look like: x/y = x part(s) of a whole divided into y part(s).
If we look at our graph above again, we can use the total number of hours as "y" (the bottom number) and each bar as a different "x" (number of those parts).
For example, Exercise = 1, the total number of hours is 24, so, Exercise's fraction is 1/24.
Presentation / Modeling / Demonstration
Demonstrate how to do math with fractions using a graph
Time: 3 mins
Moving on, still using our graph above, let's look at how much longer we sleep than exercise. Sleep's fraction is 8/24, and exercise is 1/24, because the bottom number, called the denominator is the same, we can simply subtract the top numbers, called the numerators. 8-1 = 7, so the difference is 7/24.
If the denominators (bottom numbers) are not the same, we would need to make them the same.
Looking at the image of the cake, you can see 1/2 and 1/4 markings. Remember, 1/2 means one of two parts (the whole was divided in 2, and the 1/2 part is one of those). 1/4 means one of four parts (the whole was divided in 4, and the 1/4 is one of those).
In order to subtract or add these two parts, we need to make the denominators the same. To do this, we need to change 1/2 to have a denominator of 4. We do this by multiplying it by 2. We multiply the numerator and the denominator by 2 ((1x2)/(2x2) = 2/4) and end up with 2/4. Now we can add the 1/4 + 2/4 = 3/4 (how much cake we have left!).
Have the learner solve math problems using fractions with graphical data.
Time: 7 mins
1) Using the original graph of the hours of the day, add together sleep + exercise + relaxation. What fraction of the day have we accounted for?
Hint: the denominators should all be the same already.
2) Once you have your answer, simplify it by finding numbers you can divide both the numerator and the denominator by (the opposite of how we change 1/2 to 2/4 in order to do addition).
Example: 4/12 = 1/3 (because you divide by 4). We do this in order to more easily understand how the fractions apply to our lives. We are much more used to 1/2 than 16/32!!
Have user create graph relevant to their life, and solve a math problem using the graphical data
Time: 10 mins
1) Create your own graph with something relevant to your own life.
Examples: How you spend money (x axis: what you spend it on, y axis: how much you spend); Amount of gas left in your car (x axis: day of the week, y axis: amount of gas); How many days a month you do certain activities (x axis: activities, y axis: number of days).
2) Represent one of the items you are measuring as a fraction (x/y).
3) Add together two or more items to determine how much of the whole they represent (half of my money goes to this; I have a quarter of a tank of gas left; 1/3 of the days of month I went dancing).
Hint: remember to make the denominators the same!
4) Subtract one item from another in order to represent how much more one is than the other (I have a quarter tank less gas in my car).
The introduction will explain how dividing things equally like hours in the day can be useful, and will equate this to fractions.
The presentation will show how to use the graph they used before to create and use fractions. The objective will be stated as: to show you how you can use fractions to understand planning your day.
Guided Practice: Show them how to do the activity, then have them do a similar problem. This will still be hours of the day.
Evaluation: Have them answer a similar question to above, using a graph, but use bus fare.
Assessment: Have them create a graph with something else. (offer help button - with suggestions). Have them create a math problem (real life) they can solve using the graphical data. Ask them what they found challenging or useful about the activity.
Key Terms and Concepts
Part 3: Supplementary Resources & References
A website with an interactive pizza graphic to show fractions!
None for now
None for now