How do you convert a repeating decimal in the 10000 place into a fraction?

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Isuck at math ; ^; m a student solved this problem and said the answer is 3 feet. chase had a roll of ribbon that contained 7 7/8  feet of ribbon. he cut off one piece that was 3 5/8  feet long and another piece that was 1 1/4  feet from the roll. how much ribbon was left on the roll? is the student's answer reasonable? yes, the answer is reasonable. no, the answer is not reasonable. it should be about 2 feet. no, the answer is not reasonable. it should be about 13 feet. no, the answer is not reasonable. it should be about 4 feet.

What is 100,000 times 1/100,000, using the standard method of multiplication? write the answer as 10 to a power.