I believe you mean "crotchet" which is a British musical term for quarter note. In 4/4 (common) time it receives one beat.
quaver = eighth note; semi-quaver = sixteenth note.
minims = half notes (two crochets); semibreves = whole-notes (four crotchets)
source: http://www.shanemcdonald.org/music/learn-types-of-music-notes.html
If you are in 4/4 time/ common time, a dotted crotchet rest (or quarter rest) is worth one and a half beats.
A dot adds half of the note or rest's origional value. So if a crotchet rest/quarter rest is worth one beat, the dotted crotchet rest/ quarter rest is worth one and a half (1.5) beats.
But be careful! If you are not in 4/4 time, the number of beats it is worth (but not the value when compared to other notes) will probably change!
there are two quavers in a crochet
It's called a dotted minum
four beats in a bar
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Like any other note, how many beats it is worth depends entirely on the time signature. But it is equivalent to a half note. The bottom number of the time signature indicates which note equals one beat. In 4/4 time, a quarter note gets one beat, so a minim would be equal to 2 beats. In 2/2 time (or 4/2, or anything else with a 2 on the bottom), a half note is one beat, so also a minim would be one beat.
A crochet is a note that lasts for one beat and a minim is a note that lasts for two beats so a crochet minim is a note that lasts for three beats as it is a the time of a crochet plus the time of a minim which is three beats...
A crochet has one beat.
1
it has 1 and a 1/2 beats
There aren't. A crotchet is worth one common beat, wheras a minim is worth two crotchet beats. In other words, if you are counting in half beats (quavers), a quaver is worth 2 and a minim is worth 4. So, answering your question, none really, but a half if it is complicated.
A crotchet has one beat. So it has four quarter beats. If the question refers to quarter note, it is an alternative name to the crotchet.
A dotted crotchet is worth one and a half beats .
A double dotted minim is made of 3 and a halfquarter beats; it is the minim (2 beats) plus half the minim (1 beat) plus half of the half a minim (half a beat). A double dotted crochet would be 1 and three quarter crotchet beats; the crochet (1 quarter beat) plus half the crochet (half a beat) plus half of that (a quarter of a beat). more info is on wikipedia
there is a half beat in a minim
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3 4 stands for 3 crochet beats in a bar
nothing