More ideas from Jane
Snowball Block - how to make a snowball block the easy way - Take the desired size of the finished sewn block, divide it by 3. Add 1/2 inch to that and you will have the size to make the small corner square.

Snowball Math: Take the desired size of the finished sewn block, divide it by Add inch to that and you will have the size to make the small corner square. Thus, for a block, you will cut the small square to be inches.