Even numbers are numbers that can be divided into two equal groups with no leftovers. Odd numbers are numbers that cannot be divided into two equal groups without having one left over.
Every whole number is either even or odd—never both.
Look at the ones digit of the number to decide if it is even or odd.
You only need to check the ones digit, no matter how large the number is.
Numbers up to 1,000 follow the same rules for even and odd. Here are some examples:
Checking numbers up to 1,000 works the same way as with smaller numbers—just look at the ones digit.
Even and odd numbers follow patterns that can help you solve problems and check your work.
These patterns always work. You can use them to double-check answers quickly.