I remember trying to help a member who was planning to start a pizzeria. He was looking for a sauce recipe. I found one at the PMQ Think Tank. He complained that the recipe was twice the amount he needed. As best I could tell, he didn't know how to divide by two. I remember asking myself how he could be a success in the pizza business if he couldn't divide by two.
I have also observed over the years that some people just can't handle fractions. One member asked me to convert volume measurements that were produced by one of the dough calculating tools to the measuring spoon sizes that he had. Admittedly, some of the volume measurements were not exact teaspoon sizes but the member couldn't round the numbers to the nearest measurement spoon sizes. I had to do it for him. These kinds of things do not bother me. I just know that some people are lousy with math. I remember in high school where the smarted person in my class was a girl who had the best grades in just about everything but math, where she did poorly. But for the math, she would have been number one (the valedictorian) in her senior graduating class. So, I don't hold it against people who do not do well with math.