The definition for the term overestimate is to assign too high a value to something.
Don't overestimate yourself!
overestimate
You Overestimate when the problem has over 3 digits.
Most people would estimate that as 6 (an overestimate) - 4 (an underestimate) which would estimate the answer as 2, which is an overestimate.
Advantages and disadvantages of overestimate and underestimate
The definition for the term overestimate is to assign too high a value to something.
To estimate too highly; to overvalue., An estimate that is too high; as, an overestimate of the vote.
If you have rounded up, it will be an overestimate. If you have rounded down, it will be an underestimate.
overestimate
It's an overestimate. The actual total is 1.61
Since the exact answer is 1.61, 2 is larger than 1.61 and hence an overestimate.
Underestimate