rounded to the nth place means look at the place before that
489,334,209, rounded to the ones place is the same thing: 489,334,209
rounded to ten is 489,334,210
rounded to hundred is 489,334,200
rounded to thousand is 489,334,000
rounded to ten thousand is 489,330,000
rouned to hunderd thousand is 489,300,000
rounded to million is 489,000,000
rounded to ten million is 490,000,000
rounded to hunder million is 500,000,000
