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# Remainder Operator %

The `%` operator returns the remainder of a division between two numbers.

For example, `10 % 3` returns `1`, which is the remainder when 10 is divided by 3.

```python title="Using the Remainder Operator"
remainder = 10 % 3

print(remainder)  # 1
```

<br />

## Applications of the Remainder Operator

The remainder operator is often used to determine whether **a number is even or odd** by checking the remainder when it is divided by 2.

```python title="Determine Even or Odd"
# Example of determining even or odd
number = 7

# A number is even if it's divisible by 2 with no remainder; otherwise, it's odd

if number % 2 == 0:
    print("It's an even number.")
else:
    print("It's an odd number.")
```

It can also be used to find the unit digit of a number by calculating the remainder when it is divided by 10.

```python title="Finding the Units Digit"
# Finding the units digit of a number
number = 123

ones_place = number % 10

print(ones_place)  # 3
```

You can determine if a number is even or odd by checking its remainder when divided by 2: 0 for even, 1 for odd.

### When writing code to determine whether a number is even or odd using the remainder operator, what is the appropriate code to fill in the blank?