Round 636 to the nearest ten and hundred

The six at the end is one the 3 at the middle is ten and the six at the top is hundreds

The number in the tens place is 3. The number after that is 6 which is greater than 5 so you round up. Therefore 636 rounded to the nearest tens place is 640.

The number in the hundreds is 6, the next number is 3 and since it is less than 5, you keep it at the same. 636 rounded to the nearest tens is 600.