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Adding Fractions with Unlike Denominators - Part 1 (Fraction Addition)
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- Опубліковано 26 жов 2020
- More Lessons: www.MathAndScience.com
Twitter: / jasongibsonmath
In this lesson, we will learn the very important skill of adding fractions. In this case, we will add fractions that have unlike denominators, which means that the bottom numbers of the fractions are not the same. In order to add fractions, the denominator of both fractions must equal the same number. In these problems, the first step is to change the fractions by multiplying the numerator and denominator by the same number with the goal of expressing both fractions in terms of the same denominator. Then, we add the fractions as usual and simplify the result. Here we use fraction models to understand what it means to find a common denominator and to fully understand what it means to add fractions together.
![Adding Fraction & Mixed Numbers w/ Common Denominators - Part 1 - [23]](http://i.ytimg.com/vi/ZLtb2O24lyY/mqdefault.jpg)
![Adding Fraction & Mixed Numbers w/ Common Denominators - Part 1 - [23]](/img/tr.png)
![Learn to Multiply Fractions & Understand Improper Fractions & Mixed Numbers - [29]](http://i.ytimg.com/vi/RHRvErQQT7c/mqdefault.jpg)
![Learn to Subtract Fractions (Adding & Subtracting Fractions) - Part 1 [11]](http://i.ytimg.com/vi/ORaByXP1930/mqdefault.jpg)
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*note: 6/9 is odd and even, but can still be simplified to 2/3. So when it is said that you can not simplify any further because one number is odd and the other is even, that might be a little confusing!
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Very good teaching...I'm not an english native speaker but I got the whole idea.
I want LCM addition and subtraction
I had never understood aboit fractions but now I do. Thank you very much
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I noticed that the common denominator is usually the larger denominator of the two fractions within the problem. And multiplying the smaller denominator of the two fractions by a number that makes it equivalent to the larger denominator to find the common, add, then simplify.
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why we use 2x2 and 4x2 to make 4 by 8 in simplest form why we don't use 1+1+1+1 by 1+1+1+1+1+1+1+1 and cut similar one to make 4 by 8 in simplest form
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Hi
You can also do it by finding the LCM of the denominators.
Sir what would be the answer of 2/8 + 2/9 ? The denominators are even and odd they haven't same multiples .. please sir
Make a denominator to 72. Multiply by 9 to 2/8 and multiply by 8 to 2/9 so 18/72+ 16/72=34/72
Thanks
17/36
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مرحباً استاذ ممكن تضع ترجمه لفيديو لكي استطيع فهم ماتقول . انا مهتم بلفيزياء . وشكراً
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How did you get the 2 in the fraction
im early
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I think LCM and LCD are the same except that LCM is more generally used and LCD is used with fractions, while adding fractions.
Kids would have enjoyed your lesson, adding fractions. Even the adults could if they haven't done it earlier as I did it once.
A story is to motivate
A lesson is to teach
An example is to inspire
Time is to test.
Thank you!
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@@mathsandsciencechannel I think of some shortcut methods to find LCD:
1. If the denominators of fractions are primes,just multiply them to get LCD.
2. If one denominator is divisible by another evenly,then dividend is the LCD.
3. List some multiples of larger denominator,divide those by another,the first multiple that divides enenly is the LCD.
Why multiple it by two where is two come from
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21/100
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1/3X2/2=2/6
5/6
Thanks for teaching because ihave a math competition tomorrow
1/6x2/2= 2/12
3/6 +1/3
oh thank you so much💖
1/4x2/2=2/8
67/100
1/2 +1/4
33/100
1/3x2/2=2/6
1/3+1/6
2/8 +1/4
1/2
The penny dropped when I saw the pieces of pizza.
Good content. Thanks for subscribing
Math and Science
if i add fraction and i don't simplify the sum fraction will my answer be correct ???
for example:
1/4 + 1/4 = 2/4
Yes, it is correct in that it gives the correct addition of the fractions. However, you will probably get points taken off for not simplifying to lowest terms. So, it is mathematically correct but we always want to simplify when we can.
I guess he 's right
2/12 + 1/6
1/3
1/2x2/2=2/4
Vdo is HD, nice!
3/100+20/100=23/100
me in grade 3rd
3/10x10/10=30/100
1/4+2/4=3/4