What is a units digit?

The units digit is the rightmost digit in a number and represents its ones place value. It is also known as the last digit or the smallest digit of a number. When performing arithmetic operations such as addition, subtraction, multiplication, and division, the units digit often plays an important role in determining the final result.

For example, when adding two numbers together, only the units digit of each number needs to be added together initially. When multiplying numbers, the final units digit of the product will depend on the units digit of each factor.

The units digit also has important applications in number theory and cryptography, where it is used to identify patterns and properties of numbers. In some cultures, the units digit is also thought to hold spiritual significance and be associated with luck or fortune.