SPFG, Supreme Picture Framing God
My math skills can handle fractions but for mat cutting I use 1/2+1/4-1/16 instead of using 1 11/16. Find it easier to go to the half inch mark, move to the next quarter inch and back off a sixteenth. Like when carpenters cut and measure by fat and skinny and under. As in eight foot three inches and a fat quarter.