1 (one, unit, unity) is a number, numeral, and glyph. It is the first and smallest positive integer of the infinite sequence of natural numbers.

Learn the different ways number 1 can be represented. See the number one on a number line, five frame, ten frame, numeral, word, di... Learn about the number 1.

One (1) is the first natural number, followed by two. The Roman numeral for one is I.

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...

2025年1月20日 · The number one (1), also called "unity," is the first positive integer. It is an odd number. Although the number 1 used to be considered a prime number, it requires special treatment in so many definitions and applications involving primes greater than or equal to 2 that it is usually placed into a class of its own (Wells 1986, p. 31).

In mathematics, the number 1 is the natural number [1] that follows 0 and precedes 2. It is an integer and a cardinal number, that is, a number that is used for counting. [2] . In addition, it is classified as a real number, [3] distinguishing it from imaginary numbers.

ONE is the only number that’s the same in binary, base 10 and Roman Numerals. It’s the wheels on a uni cycle, the rails on a mono rail and the players when you go solo . One is the first odd number, the first triangular, square, pentagonal and hexagonal number, and the first tetrahedral , cube and Fibonacci number.