# What’s XXI in English?

Definitions of XXI. the cardinal number that is the sum of twenty and one. synonyms: 21, twenty-one. type of: large integer. an integer equal to or greater than ten.

## What is XII?

denoting a quantity consisting of 12 items or units. synonyms: 12, dozen, twelve cardinal. being or denoting a numerical quantity but not order.

## How do you write 1999 in Roman numerals?

1999 in Roman numerals is MCMXCIX. To convert 1999 in Roman Numerals, we will write 1999 in the expanded form, i.e. 1999 = 1000 + (1000 – 100) + (100 – 10) + (10 – 1) thereafter replacing the transformed numbers with their respective roman numerals, we get 1999 = M + (M – C) + (C – X) + (X – I) = MCMXCIX.

## Who invented Hindu-Arabic numerals?

Hindu-Arabic numerals, set of 10 symbols—1, 2, 3, 4, 5, 6, 7, 8, 9, 0—that represent numbers in the decimal number system. They originated in India in the 6th or 7th century and were introduced to Europe through the writings of Middle Eastern mathematicians, especially al-Khwarizmi and al-Kindi, about the 12th century.

## What is XIX?

Definitions of xix. adjective. being one more than eighteen. synonyms: 19, nineteen cardinal. being or denoting a numerical quantity but not order.

## What does IX mean?

We know that in roman numerals, we write 9 as IX. Therefore, 9 in roman numerals is written as IX = 9.

## Which of the symbol are never respected?

Here is your answer: The symbols of roman numerals which can never be repeated are : V – 5 ; L – 50 ; D – 500.

## Which symbol is never written to the left of symbol C?

Symbols of greater value such as V, l, detc. are never written to the left of c,Since they are greater than symbol c.

## Why XXXX is not written in Roman?

XXXX, VX, IC, XVV are not used because they not make proper sequence. We can write such number 2-3 times I,X,C,M. And some numbers are only used at once only such as L,V,D. That’s why we not use these roman number.

## Why is there no 0 in Roman numerals ks2?

Why is there no “0” Zero in roman numerals? Roman numerals start to count from one and had no symbol to represent “0“. This happens because the Romans did not need to have a zero in their additive system.

## What is the Roman numeral of 1994?

1994 in Roman numerals is MCMXCIV. To convert 1994 in Roman Numerals, we will write 1994 in the expanded form, i.e. 1994 = 1000 + (1000 – 100) + (100 – 10) + 5 – 1 thereafter replacing the transformed numbers with their respective roman numerals, we get 1994 = M + (M – C) + (C – X) + V – I = MCMXCIV.

## What are the Roman numerals for 2004?

Why is 2004 in Roman Numerals Written as MMIV? We know that in roman numerals, we write 4 as IV, and 1000 as M. Therefore, 2004 in roman numerals is written as 2004 = 2000 + 4 = MM + IV = MMIV.

## What is Apostrophus?

Definition of apostrophus 1 : apostrophe entry 2. 2 : a symbol that resembles a backwards letter C and that was used in the ancient Roman number system in combination with the symbol I to represent 500.

## What is the Roman numeral symbol for 10000?

10000 in Roman numerals is X̅. To express 10000 in Roman Numerals, we will write Roman numeral ‘X’ with a vinculum or bar over it. In this article, we will explain how to correctly transform 10000 in Roman numerals.

## How do you write 4000 in Roman numerals?

4000 in Roman numerals is I̅V̅. To express 4000 in Roman Numerals, we will write Roman numeral ‘IV’ with a vinculum or bar over it.

## How do you write XIV?

We know that in roman numerals, we write 4 as IV, and 10 as X. Therefore, 14 in roman numerals is written as XIV = X + IV = 10 + 4 = XIV.

## What does XVI mean?

Definitions of xvi. adjective. being one more than fifteen. synonyms: 16, sixteen cardinal. being or denoting a numerical quantity but not order.

## Did the ancient Greeks use Arabic numbers?

The ancient Greeks were incredibly talented mathematicians—but they rarely used numbers in their math. Like Roman numerals, their system borrowed letters; like the Arabic numerals we still use, it only needed one symbol for each decimal place. …

## Who invented zero in world?

The first modern equivalent of numeral zero comes from a Hindu astronomer and mathematician Brahmagupta in 628. His symbol to depict the numeral was a dot underneath a number.

## Are Arabic numbers Indian?

Because the Arabs transmitted this system to the West after the Hindu numerical system found its way to Persia, the numeral system became known as Arabic numerals, though Arabs call the numerals they use “Indian numerals”, أرقام هندية, arqam hindiyyah. …

## What number is XD?

What is the Roman numeral XD? – Quora. It’s meant to be 490 but it’s done the wrong way. The Roman construction is supposed to be “400 + 90” and not something like “10 less than 500” (which would result in that “XD.” The proper way is 400 (CD) plus 90 (XC), resulting in “CDXC.”