How do you change 3.5 info a fraction?

The easiest way is to multiply a decimal by 10 until it's not a decimal anymore, then put the number you multiplied it by as the denominator.

For this one, multiply by 10 and you get 35/10

Now the next step is to see what number both the top and bottom can divide by. They can both divide by 5 so do that and you get 7/2.

You can stop there, but usually we don't leave it with the top number bigger than the bottom, so we need to take away 2 from the top number until it's smaller than 2, and put the number of times we took away 2 outside of the fraction.

The final answer is 3 and 1/2