Monday’s and Tuesday’s are becoming jam-packed with projects I must finish and a continuous “to-do” list I am lagging behind on. So, I’ve decided that every so often, I’ll post fun math facts I’ve learned (this relates to personal finance, right?)

I recently posted about the “borrow and pay back method” of subtraction. Well, here is another interesting way to compute subtraction problems that I never knew existed (I guess that is what college courses are for, to learn new things!)

• Subtracting with positive and negative integers:

Another subtraction model that keeps place value intact

Do you subtract this way? I found out that some people who work in the restaurant business can do this kind of subtraction in their head. It seems like an easier way to compute mentally. What do you think?