Vancouver is a city on the north bank of the Columbia River in the U.S. state of Washington and the county seat of Clark County.
The width of the twin quilt is 66 +12 (for the two extra columns of 9 patches) + 4 (for the two extra strips of sashing) =82, which is a bit wider than your target of 78, but close enough. Plus, it's nice to have it a bit too large than a bit too small.
Today we would like to share with you how to make a scrappy granny square block. The finished blocks will measure 9 before sewn into a quilt top. The finished quilt will be twin sized, about 68 x 85. For one quilt block you will need: 13- 2.5 white squares.