Cutting fabric
 

Fold it in half so you have a piece 12 1/2" X 19"

Yes, fold in half first. You should now have a piece that is approximately 10 inches wide by the length of your fabric. Using two rulers butted together, to get the 19 inches, mark the spot top and bottom, with chalk or pins. Take away the rulers and gently slide your fabric over so that you will be cutting on your board. Remeasure just to make sure you have the correct amount and cut.

Then, take the piece you have just cut and refold to do the same thing for the 25 inch cut.

What i do is I put my nail along the last line on the mat and move the fabric over. I then remeasure the fabric in front of the 0 line at the beginning to make sure it is still accurate, and measure the remaining portion. I do this if the piece is too long to just half it with a fold on the mat. If you have to move it over a few times you might have to use the 24 inch rule plus another to measure the piece in front of the line.

If you fold the fabric, which is what I do, be sure that your ruler is exactly perpendicular to the fold when you cut--that's the most important thing.

Will the fold make the lengths longer than length needed?
Thank you for your replies this has begun to open my mind up.

Are you trying to cut a piece of fabric 19 x 25 from a larger piece of fabric?

If so - lay the bigger piece on a table or the floor - do you have a yard stick? Draw a line with a pencil 25 inches on one edge.
Take your 6x24 ruler and mark off 19 inches. - this mark should look like a big L.

Go to the other end of the 25 inch line and draw another 19 inch line. now you have three sides of a rectangle drawn.

Connect the ends of the 19 inch lines - now you should have a rectangle drawn on your fabric.

At this point - you could lay the large piece of fabric on your mat and rotary cut it several inches at a time - moving it as needed.

I would probably cut the 19x25 inch piece out as 19-1/2 x 25-1/2 with scissors and then tidy up the piece with the rotary cutter and ruler.

As long as your edge is squared off, you can measure a known length (such as 10") and put a pin at that point. Pull the fabric off the cutting board and measure the remainder from the pin (19-10=9) That is where I would cut. Then turn the fabric and repeat in the other direction.

Thank you one and all.

Fold it in half so you have a 9 1/2" x 25, then again where you have 9 1/2x 12 1/2'. You will have 4layers of fabric to cut.