35 rounded to the nearest ten is 40. To round a number to the nearest ten, we need to examine the digit in the tens place, which is 3 in the number 35. If the digit in the tens place is 5 or greater, we round up to the nearest ten; if it is less than 5, we round down to the nearest ten. Since 3 is less than 5, we round down to the nearest ten, which is 30. However, since the digit in the ones place is 5 or greater, we round up to the nearest ten, which is 40.