Okay so sorry I'm not very smart when it comes to math but how do I write 2.3181818181818 (it's a repeating decimal) as a mixed number?

It is a mixed repeating decimal bc no 3 is not repeating It start at 18

To convert into fraction you take all the decimals (318) then you subtract the non repeating decimal (318-3=315

315 is the nominator

For the denominator you count how many repeating decimal (2) then you put 2 nines For every non repeating decimal you add a zero

315/990. = 7/22

2.3181818 ... = 2 (7/22)