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For more information, please see full course syllabus of Basic Math
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Lecture Comments (14)

0 answers

Post by Ana Chu on July 7, 2015

I'm sorry but don't you want the biggest cake piece, not slice it in equal four pieces?

0 answers

Post by Ana Chu on February 3, 2014

you teach really good!

1 answer

Last reply by: Professor Pyo
Thu Jan 2, 2014 5:14 PM

Post by Daniel Naftaliev on January 2, 2014

Hello, I have a question about the practice questions.
So the first question is "Q. Find the LCM of 14 and 21"
I know that I can divide both by 7 which would give me
2 over 3 but the answer says it is 42. So my question is how come the answer is 48 and not 2 over 3?

0 answers

Post by Carol Choi on September 21, 2013

its ok i got it thanks

1 answer

Last reply by: xiaolin hu
Mon May 5, 2014 1:32 AM

Post by Carol Choi on September 20, 2013

hey mary
can you help me with this thanks

a bottle is 1/4 full of cordial. if 500 ml of cordial is added to it the bottle is 2/ 3 full. how many mililitres does the bottle hold when full.

0 answers

Post by saqib pz on November 17, 2012

You are a very good teacher :)

1 answer

Last reply by: Professor Pyo
Sat Mar 2, 2013 1:05 AM

Post by Laura Weiderhaft on November 15, 2012

Wouldn't the simplest form of 4/8 just be 1/2?

1 answer

Last reply by: Mary Pyo
Sat Feb 4, 2012 12:33 AM

Post by Miguel Suarez on December 23, 2011

I think the videos are great, but they should have online practice test for each sections. please consider this request.

1 answer

Last reply by: Mary Pyo
Sat Feb 4, 2012 12:28 AM

Post by Lucy Sams on December 22, 2011

You will learn so much about fractions.She is a great teacher with this kind of subject even though she does it a different way then other people would do it.No mater she does it different or what she is a great teacher and you will love her.She so good at math that my daughter goes to her every day.

Fraction Concepts and Simplest Form

Related Links

  • Fraction: A part of the whole
  • Simplest Form: A fraction whose numerator’s and denominator’s only common factor is 1.

Fraction Concepts and Simplest Form

What is the simplest form of [(4)/(16)]
What is the simplest form of [(3)/(12)]
What is the simplest form of [(12)/(24)]
What is the simplest form of [(6)/(36)]
What is the simplest form of [(15)/(27)]
What is the simplest form of [16/32]
  • [(16 ÷4)/(32 ÷4)] = [4/8]
  • [(4 ÷4)/(8 ÷4)] = [1/2]
What is the simplest form of [27/33]
  • [(27 ÷3)/(33 ÷3)] = [9/11]
What is the simplest form of [25/50]
  • [(25 ÷5)/(50 ÷5)] = [5/10]
  • [(5 ÷5)/(10 ÷5)] = [1/2]
What is the simplest form of [16/36]
  • [(16 ÷4)/(36 ÷4)] = [4/9]
What is the simplest form of [42/84]
  • [(42 ÷7)/(84 ÷7)] = [6/12]
  • [(6 ÷6)/(12 ÷6)] = [1/2]

*These practice questions are only helpful when you work on them offline on a piece of paper and then use the solution steps function to check your answer.


Fraction Concepts and Simplest Form

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Fraction Concept 0:10
    • Example: Birthday Cake
    • Example: Chocolate Bar
  • Simples Form 3:38
    • Example: Simplifying 4 out of 8
  • Extra Example 1: Graphically Show 4 out of 10 4:41
  • Extra Example 2: Finding Fraction Shown by Illustration 5:10
  • Extra Example 3: Simplest Form of 5 over 25 7:02
  • Extra Example 4: Simplest Form of 14 over 49 8:30

Transcription: Fraction Concepts and Simplest Form

Welcome back to

This lesson is going to go over some concepts of fractions and how to simplify them.0002

When we have a fraction, we are representing it as a part.0013

If we have something that is whole, we are going to take parts of it, break it up into parts.0020

That is how we write fractions.0026

Let's pretend it is your birthday; this is your cake.0030

We are obviously going to have to cut the cake.0037

Since it is your birthday, you would probably want the biggest piece.0040

If we take this cake, let's say we are going to cut it up into 4 equal pieces.0045

If you get 1 piece of this cake, you are getting 1 piece out of how many total pieces?0055

1, 2, 3, 4; you will be getting 1/4 of your cake.0067

Let's say I cut the cake up into smaller pieces.0076

Here if you take 1 piece of your cake,0091

then you are going to take 1 out of 2, 3, 4, 5, 6, 7, 8.0099

Out of 8 total slices, you are getting 1.0107

Let's say you want more cake; you ate 3.0114

I can write this as 3 out of 8.0122

Look at this one right here; pretend that this is a chocolate bar.0131

Your chocolate bar, you are going to break it up into pieces.0137

We can break up the chocolate bar into 8 pieces.0139

If you eat 1 little piece, you are eating 1 out of 1, 2, 3, 4, 5, 6, 7, 8 pieces.0145

Let's say you eat another one; that is 2 out of 8 pieces.0159

I can also write this in a different way.0169

If the chocolate bar is broken up into 4 pieces, you break it up into 4 pieces,0182

then this right here that you ate is going to be the same thing as 1 out of 4 pieces.0188

If you look at this, 1, 2 out of 8 that you ate here0200

is going to be the same as 1 out of 4.0207

That is when we are going to learn how to simply these fractions.0220

Here we have 8 pieces.0226

4 out of 8 would be 1, 2, 3, and 4.0230

This is 4 out of 8.0244

Instead of having 8 pieces, I am only going to have 4.0251

In this case, having 4 out of 8 would be the same thing as 2 out of 40265

because I have 4 pieces and I ate 2 out of those 4.0274

If I wanted to show 4 out of 10, I need to have something... I can have a circle.0284

Or I can have something rectangular like the chocolate bar.0291

I need to 10 equal pieces; I can do this.0300

Let's say these were 10 equal pieces.0318

To show 4 out of 10... that would be 4 out of 10.0321

How can you represent this in a different way?0337

Instead of breaking this up into 10 pieces, let's say you broke it up into 5 pieces.0341

In that case, if it was 5 pieces, this would be 1.0346

This would be 2, 3, 4, and 5.0351

4 out of 10 could be the same as 2 out of 5.0357

This one, we have 6 pieces; 6 pieces.0374

If I do this, this would be 1 out of 6.0381

If I take this piece, then that would be 2 out of 6.0389

Maybe if I ate this piece, then that would be 3 out of 6.0397

If you think about it, if I have 6 pieces and I ate 3 of them, I ate 1/2.0408

I ate half of this chocolate bar.0418

Let's say I don't have a picture; I don't have a chocolate bar.0425

I just have a fraction, 5 over 25.0427

How can I write this in simplest form?0430

In this case, I can take a common factor, a number that multiplies into 5 and 25.0437

I can divide both numbers by that number.0447

5 and 25; I know that 5 goes into 5 and 5 goes into 25.0452

That means I can divide this number by 5 and divide this number by 5.0458

They have to be divided by the same number.0469

Or else you are not going to get the right answer.0471

5 divided by 5 is 1; 25 divided by 5 is 5.0475

Let's look at this fraction again, 1 and 5.0484

We have to make sure that they have no common factors besides 1.0488

For 1 and 5, that is the only common factor they have.0494

That means we are done; this is the answer.0497

The simplest form of 5 over 25 would be 1 over 5.0501

To find the simplest form of 14 over 49, we are going to look for a common factor.0514

Meaning we are going to look for a number amongst 14 and 490525

that can be multiplied to get 14 and it can be multiplied to get 49.0532

A common factor between these two numbers would be 7.0539

In order to get the simplest form, I can take this fraction,0544

divide the top number and the bottom number by that common factor.0548

Again they have to be the same number.0557

You have to divide both numbers by that same number.0560

14 divided by 7 is 2; 49 divided by 7 is 7.0566

I look at these two numbers now.0576

I want to see if there is a common factor between 2 and 7.0579

The only common factor is 1; that means I am done.0584

The simplest form of 14 over 49 would be 2 over 7.0590

That is it for this lesson; thank you for watching