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Note: Multiples of one hundred

In less formal speech and writing, especially in American usage, four-digit numbers that are multiples of 100 are often named in the following way:

1100 – eleven hundred; 1200 – twelve hundred; 1500 – fifteen hundred; 1600 – sixteen hundred; 2300 – twenty-three hundred; 4400 – forty-four hundred; 5600 – fifty-six hundred.

In British English, such use is more common for round numbers between 1,100 and 1,900.

Note that 1000, 2000, 3000, etc., are pronounced as "one thousand, two thousand, three thousand", etc.; that is, such numbers are generally not expressed in hundreds.