How to write the accounting number one or two qian in the Republic of China?

The accounting figures of the Republic of China were written in two steps.

1. The old writing of 1, 2, 3, 4, 5, 67 is one, two, three, four, five, six, seven, eight, nine, and ten. The abbreviation 123456789 is the Arabic numeral.

2. These three numbers are written in different ways and used in different places. When issuing invoices, capitalize them, which is one, two, three, four, five, six, eight, nine, to avoid imitation of these words.