Numbers

There are several how to read the numbers, some Chinese numerals, Arabic numerals, Roman numerals and characters that are used in Japan. How is the proper use bother foreigners. In addition, the speed of mental arithmetic of Japanese that seem mysterious to foreigners. Was in the abacus that I learned as a child is the secret. And specialty store which attracted only product of top ranking. Japanese stick to rankings wonder cool. How foreigners see Japanese to offertory of the shrine from the amount of your celebration, stick figures?