Yet another changing time problem - I just don't seem to be able to get my head round this at all.

We need to change 6 4 to 2 2.

We can change dotted minims to minims but the next bar is :

two quavers, crotchet, crotchet, crotchet, minim.

We've even tried getting a caluclator to take 1/3 off the value of each note, but still can't end up with 2 minim beats in a bar.

I know it must be simple, but I just can't get my head round this at all.

(We have managed to change 12 16 to 4 8!)

Many thanks

6/4 has a dotted minim beat. 2/2 has a minim beat Therefore triplet crotchets in 2/2 become ordinary crotchets in 6/4 and duplet crotchets in 6/4 become ordinary crotchets in 2/2

Therefore:

If the rhythm has triplet or duplet sign write it in new time signature and remove the triplet/duplet marking.
If it does not copy as written add triplet sign per half bar to 2/2 and duplet sign per half bar to 6/4

Remember you are making up whole beats and these are duple times with two beats per bar.

In the example you give the first triplet sign covers both quavers and the first two crotchets (beat one) and the second triplet sign covers the third crotchet and the minim.

Division is the wrong thing to do it is a case of adding up the notes to make the beats in 6/4 and putting a triplet sign on to convert to 2/2

Yes, remember about triplets.
And the one = one rule still applies.
Dividing is not the way to go. It looks like fractions but....

Many thanks - it's 30 years since I did my theory exams and my brain had buried the knowledge in a distant corner!

The basic thing is to divide the notes into two groups, one for each half of the bar, and then to work out how to write that. As you need three crotchets worth in each half there will have to be a triplet, as notes are never a third of a beat in simple time without one.