When rounding 446 to the nearest ten, you look at the digit in the tens place, which is 4. Since 4 is less than 5, you round down. Therefore, 446 rounded to the nearest ten is 440.
Well, honey, 446 rounded to the nearest ten is 450. It's not rocket science, just basic math. So, there you have it, 446 becomes 450 when you round it up. Hope that clears things up for you!