Tenth century “West Arabic” variation of the Nepali form of Hindu-Arabic numerals (compare Devanagari script १ (1, “éka”)), possibly influenced by Roman numeral Ⅰ, both ultimately from using a single stroke to represent the number one. Learn the different ways number 1 can be represented. See the number one on a number line, five frame, ten frame, numeral, word, dice, dominoes, tally mark, fingers and picture representations. 1 is the natural number exceeding 0 and preceding 2, the Hindu-Arabic numeral for the number one (the unit). It is the smallest positive integer, and smallest natural number. 1 is the multiplicative identity, i.e. any number multiplied by 1 equals itself, for example: a ⋅ 1 = a \displaystyle a. 在数学中，1为乘法单位元，即任何数字与1相乘皆等于其本身。 按照惯例，1不被视为素数。 在数字电路中，1表示 二进制 中的“开启”状态，是计算技术的基础。 在 哲学 领域，1在诸多传统中象征着终极现实或存在的本源。 The meaning of ONE is the first whole number above zero. How to use one in a sentence. The number 1 is the first natural number after 0. Each natural number, including 1, is constructed by succession, that is, by adding 1 to the previous natural number. Educational video for children to learn the number 1. The little ones will learn how to trace number 1, how to pronounce it and also how to count with a seri. 1 (one, unit, unity) is a number, numeral, and grapheme. It is the first and smallest positive integer of the infinite sequence of natural numbers. The glyph used today in the Western world to represent the number 1, a vertical line, often with a serif at the top and sometimes a short horizontal line at the bottom, traces its roots back to the Indians, who wrote 1 as a horizontal line, as is still the case in Chinese script. In scientific notation, it is written as 1 × 10 0. It has a total of 0 prime factors and 1 positive divisors. There is one positive integer (up to 1) that is relatively prime to 1. The prime factorization of 1 is 1. Since it has a total of 0 prime factors, 1 is a composite number.