yosuke_furukawa:Reading Japanese number is different from reading English number. English number has comma each three digits like 1,000,000. In this case, it is easy to read like 1 million. However Japanese number is different reading ways like each 4 digits like 1,000,000 => 100,0000 => 100万. When I was young, I was not familiar with the Japanese style. Currently I could read Japanese number with long digits easily. but If the digits are too long, I am not so good at reading it. I don't have so much experiences reading mathematical symbols... I only have read like minus, plus, multiply, divide, equal, etc... It is not so hard.