subtracting-mixed-numbers

In this video you will learn how to subtract mixed numbers.

For example, 2 3/4 -1 1/2

http://www.moomoomath.com/

Transcript

Welcome to MooMooMath where we upload a new Math video everyday. In this video I would like to practice subtracting mixed fractions What I like to do is to convert the mixed fraction to a improper fraction and then subtract them. For instance, lets subtract 3 1/2 - 2 1/4 First thing I will do is to go ahead and convert the mixed fraction to an improper fraction. So I will multiply 3 x 2 = 6 plus one is 7 I like to subtract in a vertical fashion. Next, multiply 4 x 2 + 1 = 9 over 4

Now I will subtract those two fractions. Next, I will get a common denominator and it will be four. 2 will divide into 4 two times, and 2 x 7 = 14 over 4 minus 9/4. Now I can subtract the fractions. 14 - 9 = 6 =5 over 4. I can now convert this improper fraction into a mixed fraction. 4 goes into 5 one time and I have 11 left over which wil equal 1 1/4

Lets look at example 2. 3 1/16 - 2 1/2

Step 1 is to convert the mixed fractions into an improper fraction. 16 x 3 = 48 + 1 = 49 over 16 - 2 x2 =4 + 1 = 5/2

I now find a common denominator. Which is 16. 16 goes into 16 one time. 1 x 49 =49 over 16

2 will go into 16 8 times and 8 times 5 = 40 over 16

I can now subtract the fractions because they have common denominators. 49-40 = 9 over 16.

I cannot simplify this fraction further.

One last example lets go with 3 3/4 - 2 1/16

Convert into an improper fraction.

4 x 3 =12 + 3 = 15 over 4 and we will subtract that from 16 x 2 =32 + 1 = 33/16

I now need to find a common denominator, which will be 16

4 divides into 16 four times and 4 x 16 = 60.

4 into 16 =4 and 4 x 15 = 60 over 16 minus,

16 goes into 16 one time, and 33 x 1 =33. I'm let with 60 -33 which is equal to 27 over 16 because that is our common denominator. Again 60 -33 = 27 and 16 will go into 27 one time and you have 11/16 left over.

Let me show you how I converted into a mixed fraction.

16 goes into 27 one time.

16 x1 = 16 and 27-16 = 11

That is how I ended up with 11/16

Hope this helps with subtracting mixed fractions.

If you enjoyed this please share.

MooMooMath uploads a new Math video everyday.

You may also enjoy..

How to add or subtract mixed numbers

https://www.youtube.com/watch?v=J8kjXfD4xas

-~-~~-~~~-~~-~-

Please watch: "Study Skills Teacher's Secret Guide to your Best Grades"

https://www.youtube.com/watch?v=f3bsg8gaSbw

-~-~~-~~~-~~-~-

Learn even more about fractions with this fraction playlist that covers the basics of fractions!!

https://www.youtube.com/playlist?list=PLurjkZV1ykGa0cb4iAUs2FZLS-ClkRHmq

Tagged under: fractions,subtracting,mixed fractions,math,moomoomath,mixed numbers

Clip makes it super easy to turn any public video into a formative assessment activity in your classroom.

Add multiple choice quizzes, questions and browse hundreds of approved, video lesson ideas for Clip

Make YouTube one of your teaching aids - Works perfectly with lesson micro-teaching plans

1. Students enter a simple code

2. You play the video

3. The students comment

4. You review and reflect

* Whiteboard required for teacher-paced activities

With four apps, each designed around existing classroom activities, Spiral gives you the power to do formative assessment with anything you teach.

Quickfire

Carry out a quickfire formative assessment to see what the whole class is thinking

Discuss

Create interactive presentations to spark creativity in class

Team Up

Student teams can create and share collaborative presentations from linked devices

Clip

Turn any public video into a live chat with questions and quizzes

Tried out the canvas response option on @SpiralEducation & it's so awesome! Add text or drawings AND annotate an image! #R10tech

Using @SpiralEducation in class for math review. Student approved! Thumbs up! Thanks.

Absolutely amazing collaboration from year 10 today. 100% engagement and constant smiles from all #lovetsla #spiral

Students show better Interpersonal Writing skills than Speaking via @SpiralEducation Great #data #langchat folks!

Dr Ayla Göl
@iladylayla

A good tool for supporting active #learning.

The Team Up app is unlike anything I have ever seen. You left NOTHING out! So impressed!