Percent for Dummies!
Background:
Christopher Bejar is a graduate of Philippine Normal University (Manila, Philippines) with a Bachelor of Secondary Education majoring in Mathematics. He has taught high school for seven years and presently teaching Grades 6 and 7 |
Created
by Christopher Bejar
Location: P141K in Brooklyn
Grades: 6th through 7th
Subject: Math |
Aim:
How to find the Percent of a Number?
Instructional
Objectives:
In this activity, students will be able to
- create a model for certain percents
- visualize percents through the model
- find the percent of a number using the model
Vocabulary or Key Concepts:
Percent is the ratio describing a part of a hundred.
Materials:
Colored illustration papers
Visual materials of Model 20, Model 25 and Model 10 (as shown in the procedures)
Procedures:
Session 1
“Follow Me” (Paper folding)
Students will be given strip/s of paper to be folded according to a desired model namely:
1. Model 25
2. Model 20
3. Model 10
The teacher will demonstrate on how to fold the paper on each model one at a time. The students will follow the way the teacher folds the paper.
Model 25
- Mark the left end of the paper 0% and the right end as 100%.
- Fold the paper in 4 parts.
- Mark each part as 25%, 50%, and 75% respectively.
Model 20
- Mark the left end of the paper 0% and the right end as 100%.
- Fold the paper in 5 parts.
- Mark each part as 20%, 40%, 60%, and 80% respectively.
Model 10
- Mark the left end of the paper 0% and the right end as 100%.
- Fold the paper in 10 parts.
- Mark each part as 10%, 30%, 40%, 50%, 60%, 70%, 80%, and 90% respectively.
Session 2
Show how to use the model by solving some problems.
Examples
- What is 25% of 60?
Guided questions
"Which model has 25%?”
"How many parts do you see on this model?"
"If 60 is to be divided by 4 parts, then what is each part?"
Model 25
“So, what is 25% of 60?” …50%? …75%?
- What is 30% of 80?
Guided questions
“Which model has 30%?”
"How many parts do you see on this model?"
"If 80 is to be divided by 10 parts, then what is each part?”
Model 10
“So, what is 30% of 80?”
Activities:
Session 1
Class/Group Work
Paper folding “Follow Me”
Session 2
Individual Work
Solving the Percent of a Number by using the model
Extension or Follow-up:
Students can keep their model and pull it out anytime they need.
Give more exercises found in their textbook.
Homework:
Carlos bought a video game for $50 with a 10% tax. What is the amount the tax? How much will he pay in all?
Evaluation:
What have you learned today? How did you learn it?
Standards:
Use of a model strategy to find the percent of a number.
Students:
This activity is suited for middle school students. Giving them an alternative way to solve percents is worth a try. A concrete visual of how the percent works would be a great help for them to understand percent better.
Tips for the teacher:
Make a visual aid of the 3 models of percent. (as shown in the procedures)
You may cut an 8 in x 11 illustration paper into 8 crosswise parts as shown in the figure to be given to the students during the paper folding activity.
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