Even and Odd Arithmetic Patterns

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Even Numbers

Any number (integer) that can be divided exactly by 2.
The digit at ones place is 0, 2, 4, 6 or 8

Odd Numbers

Any number (integer) that cannot be divided exactly by 2 .
The digit at ones place is 1, 3, 5, 7 or 9

Adding and Subtracting

When we add or subtract even or odd numbers the results are always:

even + even = even
odd   + odd  = even
even + odd  = odd
odd   + even = odd

The result is same if the operation is subtraction.

Let’s understand with an example

Is 96 – 15 even or odd?
96 is even. 15 is odd.

Use the rule:

even – odd = odd

96 – 15 is odd.

Now check your answer by doing the math.

96 – 15 = 81

Yes, the answer is odd. 81 ends in a 1, which makes it odd.