【How many quadratic expression can you factor?】

This is an Apps for factorization.

This Apps was made for junior high school students who need to practice factorizations, people in general who like calculations, and middle-aged men who want to stay sharp.

In top page, you can select
Usual factorization,
Time trial of 10 factorizations, and
Reading of time trial ranking.

Explanation Page
https://todapps.wordpress.com/%e3%81%b2%e3%81%9f%e3%81%99%e3%82%89%e5%9b%a0%e6%95%b0%e5%88%86%e8%a7%a3support/?frame-nonce=62b8a17a03

Explanation Video(Japanese)
https://youtu.be/V7Wn41f6VNs
https://soundeffect-lab.info/