Common time is 4/4, so you to get 4 beats you need 2 half notes.
Two half notes equal one whole notes.
3 notes
2
Four (4) quarter notes are equal to two (2) half notes.
4
Actually, 2 quarter notes equal one half note.
12. Every note in the chromatic scale is a half step from its consecutive notes.
1
4 or four
'One' Half Note = 2 Beats therefore, there are 2 half notes in 4 beats.
An odd number of half notes cannot be replaced by a whole note, unless the half notes are part of a triplet. There are 2 half notes in a whole note, and 4 in 2 whole notes. Three half notes can be represented by 1 whole note and 1 half note. This is only true if the half notes are slurred together in the first place.
You need eight 8th notes to equal two half notes.