Math
posted by Lia .
When I am rounded to the nearest 10, I am 80. The sum of the two digits is 15. What number am I?

75, 76, 77, 78, 79, 81, 82, 83, 84
Which of those numbers have digits that add up to 15? 
when i am rounded to the nearest hundred, i am 400. The digit in my tens place is 4 more than the digit in my hundreds place. the digits in my hundreds place and ones place are the same. what number am i?