I would skip the math because... hello? It’s math! I’d keep the 2 yd piece intact but cut down by “eyeballing” the amount you need with overhang plus a little for shrinkage that happens when you quilt.
I’d cut the 1 yd piece in half lengthwise and sew the short ends together. Then I’d sew a contrasting strip between them for visual interest, even though it’s not mathematically necessary. Then trim around the perimeter, leaving yourself the needed overhang for sandwiching.
Take my advice with a very big grain of sAlt. i’d rather waste a little fabric than a lot of time doing math! LOL