Incidentally, the irrational fear of the number 13 is Triskaidekaphobia which comes from the Greek tris (three) + kai (and) + deka (ten). There is more than one prefix for each number as they come from different languages (usually Latin or Greek), or they are spelled different ways in different words. For example, a hemisphere is half a sphere. There are prefixes which describe numbers. For example, you don't say two thousand, zero hundreds, zero tens and two.Ī prefix is part of a word, at the front. There is a word for zero, but you don't use it inside a number. But you need the word thousand to tell you how big the first two is. You might think it was positional, as the same numbers get used no matter how large the number is. If this was a number system, then it wouldn't be unary or positional. Cheques are written using words as well as numbers. However, if we write numbers, we usually use the symbols instead. Even then, we use the words for the digits. We use these words when we talk of numbers, unless we are describing a long number, like a telephone number. Enter a number to see what the words are, or click on Count numbers. We learn these words as children, or even babies, long before we meet our 1,2,3. But numbers can be described as words as well. When learning about numbers, it's easy just to think about the number symbols. British Sign Language - Deaf people's words for numbers.
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