Well basically First get the 9 out of there Round 80 to the nearest hundred wicth is 100 then round 9 to the nearest 10 wicth is 10 take away the 1 and add to the end of 100
1000
round 90 to the nearest ten
100
372 rounded to the nearest hundred is 400
100
300
99,999nearest hundred is 99,900and100,00099,999-99,900=99100,000-99,999=199,999nearest is 100,000
100
100
100
10100