## Prealgebra (7th Edition)

$\underset\uparrow51,682,700$ Starting from the left, each set of 3 numbers is a period. $\ \ \ \ \underbrace{51},\ \ \ \underbrace{682},\ \ \ \ \underbrace{700}$ millions;thousands;ones Within each period the place values, from the left, are ones, tens, hundreds. Since the 5 is in the tens place in the millions period, 5 is in the ten-millions place.