Quite frankly, I mean no offense, but I've been
getting along with very little of it so far.
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In most of the world, these are the numbers which you would use in daily life.
The Hindu-Arabic numeral system which uses the digits: 1, 2, 3, 4. 5 .... etc
Hindu-Arabic numerals are found in every aspect of life. They are, in fact, our default number system.
Radical expressions are applied in one's daily life. This is used in terms of doing tile work, estimating distances, or designing something that needs measurement.
Arabic numerals are the ones that most people use everyday: 0123456789. Roman Numerals are the ones that use latin letters to represent numbers, like III (3) or XIV (14). You're unlikely to encounter them in everyday life except when they're used as a stylistic choice.