## HorseCrazyGirlForever Group Title How do I add fractions? one year ago one year ago

1. Esteven Group Title

Are the denominators the same?

2. HorseCrazyGirlForever Group Title

No.

3. Eulie Group Title

4. Eulie Group Title

5. Eulie Group Title

those might help

6. HorseCrazyGirlForever Group Title

I don't like to watch videos because I never learn from them... :(

7. Eulie Group Title

oh sorry then

8. Zarkon Group Title

$\frac{a}{b}+\frac{c}{d}=\frac{a\times d+c\times b}{b\times d}$

9. SheldonEinstein Group Title

What @Zarkon did , is said to be use of LCM ..

10. screamincat Group Title

If the denominator is not the same then you will have to find the most common one. then add the top numbers and keep the denominator same. Been awhile sence i done then.

11. ethompsonn Group Title

|dw:1351266657384:dw|

12. ParthKohli Group Title

${\heartsuit \over \spadesuit}+{\diamondsuit \over \clubsuit} = {\heartsuit\clubsuit + \diamondsuit \spadesuit \over \spadesuit \clubsuit}$

13. SheldonEinstein Group Title

LCM ---> Least common multiple just like I want to give you an example of LCM in addition of fractions : $\large{\frac{3}{4} + \frac{4}{5} = ?}$ Now, to add these fractions , we need to take LCM of the denominators of both of the fractions... i.e. of 4 and 5 Multiples of 4 = 4,8,12,16,20,32,36,40 .... Multiples of 5 = 5,10,15,20,25,30,35,40... Common multiples = 20, 40 , ... Least common multiple = 20 So from this we get LCM of 4 and 5 is 20 Now divide 20 by 4 , you get 5, multiply 5 by the numerator of the first fraction i.e. 5 * 3 = 15 .Similarly for second fraction, divide 20 by 5, you get 4, multiply 4 by 4 = 16 $\large{\frac{5*3 + 4*4}{20} = \frac{15+16}{20} = \frac{31}{20} }$

14. ParthKohli Group Title

Although, you can straightforwardly add the numerators if the denominators are same.

15. ParthKohli Group Title

Why we use LCM is to get to a point where we can straightforwardly add the numerators.

16. HorseCrazyGirlForever Group Title

SO what would 4/3 + 7/6 =

17. ParthKohli Group Title

Get a common denominator.

18. SheldonEinstein Group Title

Instead of LCM you can also do "common denominators" : $\large{\frac{4}{3} + \frac{7}{6} = ? }$ Let us take 4/3 first : multiply denominators and numerators by 2 $\large{\frac{4\times 2}{3\times 2} = \frac{8}{6}}$ So, we can also write 4/3 as : 8/6 Now let us take L: 7/6 See we have to get common denominators in both the fractions. we have one fraction as 8/6 and another one is 7/6 Their denominators are same i.e. 6 so we can just add numerators "now" : $\large{\frac{8}{6} + \frac{7}{6} = \frac{8+7}{6} = \frac{15}{6}}$

19. SheldonEinstein Group Title