If the number has 1 or 9 at its unit place, then its square will always have ___ in its unit place.
3
1
9
Both 1 and 9 are possible
A number ending with 1 or 9 will always have its square ending with 1.
Square of a number ending with 1 or 9 will always have unit digit as 1.
If a number has 2 or 8 in the unit place, then its square ends in