When rounding a number to the nearest ten, we look at the digit in the ones place. In this case, the ones digit in 25 is 5. Since 5 is greater than or equal to 5, we round up to the nearest ten, which is 30. Rounding to 20 would be incorrect in this case because 5 is closer to 30 than it is to 20.
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25 is rounded to 30.
The next digit at the right of 2 is 5 so add one to 5.
If the next digit at the right of 5 is more than 5, add one also.
If the next digit at the right of 5 is less than 5, retain 5.
30
the smallest number that can be rounded up to the next ten would be 5. anything below that is rounded to the last ten. eg, 24=20, 25=30, 26=30
30 30 because 5 up 4 down
(20 + 30)/2 = 25
25 is exactly between 20 and 30.