how do u estimate decimal

like 11.6 and 0.25

Estimation is about rounding answers to the nearest whole or to a simple fraction.

11.6 is closer to 12 than it is to 11 so we can estimate that

11.6≈12

And. 25 is closer to 0 than it is to. 5 so we can estimate

.25≈0

It also depends what place we are rounding to, we can say that. 25 is close to. 3 because we don't want to have a 0 value

.25≈.3

If the number is 0-4 round it down to number that comes before. If the number is 5-9 round it up to the number that comes after.