Tag Archives: Elementary Math

Recent insight on the GCF (and GPGCF)

Two factors limit the size of the GCF for any two numbers. Those factors are: 1) the difference between the two numbers, and 2) the size of the smaller of the two numbers. Whichever of these two factors is smaller is the Greatest Possible Greatest Common Factor, also known as the GPGCF.

Place Value Metaphor

During the summer I get to tutor a lot of elementary age students, remediating them on the basics. Almost invariably I find that these students are confused about PLACE VALUE, and considering how critical this concept is to all of math, I decided to write this post. Whenever I have the least suspicion that a […]