20987 when rounded off to the nearest ten will be ___.
To round off a number to the nearest ten, we check the last digit of the number.
If the last digit is less than 5, we round down the number to the nearest lower multiple of 10.
If the last digit is 5 or more than 5, we round up the number to the nearest higher multiple of 10.
In 20987, the digit in the ones place is 7. The nearest multiples of 10 for 20987 are 20980 or 20990.
Since 7 is greater than 5, 20987 will be rounded off to 20990.