Round to the nearest ten and hundred 829

To the nearest ten, 829 would become 830 because the ones digit (9) is closer to 30 than it is to 20. So we would round up.

To round to the nearest hundred, we look at the tens and ones digit. 29 is less than 50 so we would have to round down to 800 instead of rounding up to 900.

Hope that helps :)

Polar coordinates is 8,9