1. 1= 125/125 so plug it in and it will show 125/125- 1/125 that equals 124/125 is your answer.
2. Covert by finding an common denominator like 6/36 is the same to 1/6 as both nominator and denominator can be divide by 6 to make denominator for both factions 6. 1/6 + 5/6 = 6/6 which in other words 1 is your answer.
Hope that help.