You do nothing.
450 is already rounded to the nearest ten.
60
450
450
7480
When rounding a number, you look at the digit to the right of the place value you are rounding to. In this case, 450 is being rounded to the nearest ten. The digit in the tens place is 5, which is greater than 4, so you would round up. Therefore, 450 rounded to the nearest ten is 450.
It is already rounded to the nearest ten as 450
It is 440 when rounded to the nearest ten. As the 4 in the units place is less than 5, it is rounded down. Note: If the 4 units had been 5 or more, it would be rounded up. So 445 would have become 450
60
450
The nearest ten is zero. Rounded up, it's 10
450
20
0
70
The value of 321 rounded up to the nearest tens place is 330.
10
10, if you are rounding to the nearest 10.