Eli takes a typing test and types all 300 words in 1/10 hour. he takes the test a second time and types the words in 1/12 hour. was he faster or slower on the second attempt.

He was faster. If you have a pie and cut it into 12 pieces and only eat one, you have less than if you were to  cut it into 10 pieces and have one.

1/10 is your answer. A way to do it is called the Butterfly Method or the X Factor. It will be easy for you if you know your multiplication facts. All you have to do is time the numerator of one fraction to the other. And the one that has the biggest number is the biggest fraction.