To round 679 to the nearest 10, we look at the digit in the ones place, which is 9. Since 9 is 5 or greater, we round up. Therefore, 679 rounded to the nearest 10 is 680.
To round 679 to the nearest 100, we look at the digit in the tens place, which is 7. Since 7 is 5 or greater, we round up. Therefore, 679 rounded to the nearest 100 is 700.
Thus, the answer is 680, 700.