I need help adding and subtracting fractions. I dont really get how you change the denominations.

Here to help! See explanation

Step-by-step explanation:

Hey there! It's really simple once you get the hang of it, I'll show you!

Example:

First, we have to remember that we can't add fractions with different denominators. So we have to look for the least common denominator, also known as the least common multiple.

In this case, the smallest number that both 3 and 4 make is 12.

Now, we have to multiply both fractions by what it takes to get to twelve. 3 has to be multiplied by 4, and 4 by 3.

Now that we have the same denominator, all we have to do is add the numerators.

I hope this helped!

how long did the flood last

step-by-step explanation:

then i will answer