Should large numbers be formatted with delimiters?

1. Do you use a comma when writing large numbers?
2. Should 1000 have a comma?
3. Are commas necessary in numbers?
4. Why do we not put commas when writing hundreds?

Do you use a comma when writing large numbers?

In large numbers, commas are used to help the reader. A comma is placed every third digit to the left of the decimal point and so is used in numbers with four or more digits. Continue to place a comma after every third digit.

Should 1000 have a comma?

In English, we use commas to separate numbers greater than 999. We use a comma every third digit from the right. More than 50,000 people turned up to protest.

Are commas necessary in numbers?

In most numerals of one thousand or more, commas are used between groups of three digits, counting from the right. However, in scientific writing, commas are often omitted in four-digit numbers. No commas are used in page numbers, addresses, and years (though years of five digits or more do include the comma).

Why do we not put commas when writing hundreds?

Answer. Because it is unnecessary to label each section of numbers like we do with integers. For integers, we label them by thousands, millions, and so on, because they get very big.