To write the name of a number in the thousands, first write down the number of thousands, then the number of hundreds, then the number that is in the tens and ones places.

Example: Write the name of \(621\) in words.

There is a \(6\) in the hundreds place. It represents \(600\) and is written six hundred.

There is a \(21\) in the tens and ones places. It is written twenty-one.

So, \(621\) is written six hundred twenty-one.

Example: Write the name of \(4,917\) in words.

There is a \(4\) in the thousands place. It represents \(4,000\) and is written four thousand.

There is a \(9\) in the hundreds place. It represents \(900\) and is written nine hundred.

There is a \(17\) in the tens and ones places. It is written seventeen.

So, \(4,917\) is written four thousand nine hundred seventeen.