I Will Medal And Fan Best Answer! I need explanation AND answer!
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3/4 + 3/10
Write your answer as a fraction in simplest form.

- anonymous

- katieb

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- anonymous

21

- anonymous

21?

- anonymous

just kidding im just messing around

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## More answers

- anonymous

-_-

- ccswims

you must find the common denominator between 10 and 4

- anonymous

i know what to do, just not good at knowing how

- ccswims

ok, the common denominator is 20, because 10 can go into 20, and 4 can go into 20

- ccswims

but you cant just leave it as 3/20.
for 3/4 you multiplied 5*4 to get 20. so now you must multiply 3*5 also

- ccswims

what you do to the denominator you must ALWAYS do to the numerator

- ccswims

so now you have 15/20, correct? because 3/5 = 15 and 4/5 = 20

- anonymous

i don't get that last part

- ccswims

now you must do the same to 3/10, except this time you multiplied it by two because 10*2 = 20. so now, instead of multiplying 3*5, you are going to multiply 3*2

- ccswims

ok, so you need help more on the last part?
ok, so when you go to find the common denominator, you have to multiply the same number you multiplied on the bottom, to the top.

- ccswims

so, for example, if i wanted the common denominator to be 10, and we had the fraction 2/5, you would multiply 5*2 to get 10 right?

- ccswims

well, you must also multiply 2 to the numerator (2*2) because you did that to the denominator

- ccswims

get it?

- ccswims

so basically, whatever you do to the bottom you must also do to the top.

- ccswims

ok, so now do what we did with 3/4 (and remember we got 15/20) now do it with 3/10

- anonymous

i don't get most of that........

- anonymous

Sorry, i'm stupid

- ccswims

your not stupid, this certain part just may not be your strong suit, for instance my weak part in math is angle proofs and parabolas and postulates. you'll get it tho.
tell me where you exactly start to drop. where exactly do you not understand?

- anonymous

I don't understand MOST math. This is when i lost: so now you have 15/20, correct? because 3/5 = 15 and 4/5 = 20

- ccswims

you arent dividing. its not 3/5, its 3 * 5. ok, what doesnt make sense to you during that part? why i multiplied the number outcome?
Like, do you know why i multiplied 3 * 5 and 4 * 5?

- anonymous

no

- ccswims

ok, we need to get the common denominator because you cannot currently add
3/4 + 3/10 because the denominators are different

- ccswims

20 is the least common denominator we can use.

- ccswims

do you know why i picked 20?

- anonymous

no

- ccswims

ok, i picked 20 because both 4 and 10 can go into 20, right?

- anonymous

yes

- ccswims

ok, how do we multiply 4 to 20

- ccswims

what number multiplies with 4 to get 20?

- anonymous

5

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