3
the digit 0
"Single digit numbers".
1 is the most used digit because of 100
It isn't, so the question is pointless.
101
Every mathematician uses/used integers. It is one of the most important number sets.
1
Zero.
Integers can be positive or negative.
It is used 300 times.
integers are used in skateboarding by using positive integers like 180 360 540 720 and 900
The set of integers is represented by Z.