40
When rounding to the nearest ten, look at your number that’s in the ones place. If that number is 0-4, then you’ll round down. For example, if the given number was 33.8, then the number would be 30 after being rounded. If the number is 5-9, then you’ll round up. Since the number is 35.8, you’ll round up to 40, which is the nearest ten. Hope this helps!