#### Answer

three hundred eight million, sixty three thousand, five hundred fifty seven

#### Work Step by Step

From the right, each set of 3 digits is a period.
$\ \ \ \ \ \ \ \ \ \ $thousands
$\underbrace{308},\overbrace{063},\underbrace{557}$
$\ \ $millions$\ \ \ \ $ones
To write a number in words, write the number for each period,working left to right, in words, followed by the period name. (No name is written for the ones period.)
For each 3 digit period, the place values reading from the left are the hundreds, tens and ones place.
308 is in the millions period. It has 3 in the hundreds place and 8 in the ones place, so is three hundred eight million.
063 is in the thousands period. It has 6 in the tens place and 3 in the ones place, so is sixty three thousand.
557 is in the ones period. It has 5 in the hundreds place, 5 in the tens place and 7 in the ones place, so is five hundred fifty seven.