What are 1/8 notes in piano and dotted notes and how to transkate them in 4 4 time?

well, there are 8 eighth notes in one measure of 4/4 time. That means there are two eighth notes per beat. a dotted note means they get the full amount of beats and then an additional half that amount ... If it is a dotted half note, then it gets three notes. If it's a dotted quarter note, it gets 1 and a half beats.

half note = 2 beats (in 4/4 time)

dotted half notes = 2 beats + (2/2=1) = 3 beats

quarter note = 1 beat

dotted quarter note = 1 beat + (1/2-.5) = 1 1/2 beats