Material：
List Japanese 数字 Numbers and Numerals
PDF
Commentary：
数字 (
Hiragana: すうじ
Romaji: Su-u-ji) means numbers or numerals.
In the Japanese school curriculum, we use two character sets to count numbers:
漢数字 (
Hiragana: かんすうじ
Romaji: Ka-nn-su-u-ji) like 一 二 三 四.
アラビア数字 (
Hiragana: あらびあすうじ
Romaji: A-ra-bi-a-su-u-ji) like １ ２ ３ ４.
漢数字 is used in traditional writing. アラビア数字 is used in math and science writing.
Most numbers have
音読み (
Hiragana: おんよみ
Romaji: O-nn-yo-mi) and
訓読み (
Hiragana: くんよみ
Romaji: Ku-nn-yo-mi).
音読み comes from the Chinese sound, and 訓読み comes from the Japanese native sound. For example, １ reads いち (
Romaji: I-chi) in 音読み and ひとつ (
Romaji: Hi-to-tsu) in 訓読み.
Further study：
Japan Ministry of Education (文部科学省).
学習指導要領 生きる力. 2017.
Republic of Korea Ministry of Education (대한민국
교육부).
People's Republic of China Ministry of Education (
中华人民共和国教育部). Tōngyòng Guīfàn Hànzì Biǎo (通用规范汉字表). 2013.
U.S. Department of Education (アメリカ合衆国教育省).