Lost my marbles...
 

I can't think today,,,,if I use 4 1/2 blocks,how big should the white triangles be with the fold and trim method???

If the fold & cut method you are referring to is like making flying geese, then I would assume that your normal formula for 2x4 inch finished FG is cut a rectangle 2 1/2 x 4 1/2 with a square of 2 1/2" for the corner. So I am guessing your squares should be 2 1/2". Someone will post a better method if I am wrong.

yep, 2 1/2 inches. just think of half the size of your square. 4 1/2 in half is 2 1/2 (for the corners)

Half of 4-1/2" is 2-1/4" . Sorry to but in but, dividing fractions is easy for me.

I was sitting here wondering if my brain was so tired it wasn't working right. I knew 2 1/4 was half or 4 1/2!

Phyllis...You are right and it came to me after I asked the question....my mind has been mush since my hubby passed and I have lost my home too,so I'm not functioning the best!!! Thanks all!!

Caroline, when I saw the name of your thread I immediately started to chuckle at what it would be. I've been losing my marbles steadily for awhile hahaha! :D

Wouldn't the small square need to be larger than 2 1/4? I'm in a fog too at the moment, but if you used this size, there would be no 1/4" seam allowance at the top. I would be inclined to use at least a 2 1/2" square with the 4 1/2"
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The blue line is the cutting line.

Gay, that's what I was thinking, too--that HSTs aren't as simple as "1/2 the size of your square" . They're bigger, usually by 7/8 to 1" bigger, right? I could be way off, here, as math and I aren't friends, and the clock says nearly midnight.
Confusion is never out of the question between my ears.

If you are still able to attempt quilting after losing your DH and your home, then you are doing well. I would be in a straight jacket somewhere in the back of the asylum.

Marcia