You have enough of the same hst's to use the magic 8 method. There are 8 blue/green hst's in the block and 16 blue/gold. This method is accurate and fast since you're working in multiples. Plus there is a formula for making any size hst. I made a top similar to yours called square pants and I made the hst's one at a time. I am still burned out on hst's. If I need more than 8 in a quilt, and most do, I use this method. For me it's the only way to go. I do the same for flying geese (no waste method).