A good way to introduce this starter is to put up a map of the world and get learners to point out Japan. As a teacher you can then move into how Japanese Pupils learn to multiply.
Shouldn't the focus be on teaching kids to multiply, rather than teaching them that "all Japanese people do it this way, look how strange"? How do the Germans do math? What about Indians?
It really frustrated me that the author chose to illustrate a potentially very helpful teaching aide by focusing so much of the apparent strangeness of Japanese culture. Not exactly setting a very good example.