Quick Facts for GRE 2010

### LCD - lowest common denominator

Cross out any prime factor in the second denominator that already appears in the first denominator. then multiply the rest.

### Median

the middle value in a set containing odd numbers; a set with even numbers it is the average of the two middle terms.

### Fractions or decimals less than 1 raised to a power

will result in a number smaller than the original number