Musical Notation
If a crotchet is taken as lasting for one beat, then the semibreve is 4 beats , the minim 2, a quaver 1/2, a semiquaver 1/4 and demi-semiquaver is 1/8. They are written in musical notation as shown here:Note | Symbol | Duration (beats) |
---|---|---|
Semi-breve | ![]() | 4 |
Minim | ![]() | 2 |
Crotchet | ![]() | 1 |
Quaver | ![]() | 1/2 |
Semiquaver | ![]() | 1/4 |
Demisemiquaver | ![]() | 1/8 |

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Binary fractions are written using column headings as follows:
... 8 4 2 1 · 1/2 1/4 1/8 ...So 1/4 = 0·012 and 3/8 = 0·0112 since it is 1/4+1/8.
In binary, a dot after a crotchet adds a one in a fractional column:
crotchet = 1and so on.
crotchet dot = 1·12
crotchet dot dot = 1·112
crotchet dot dot dot = 1·1112