Odd number
Definition
Worked examples
Common mistakes
- \(0\) is odd → \(0\) is even Zero is divisible by 2, so it is even. Odd numbers leave a remainder of 1 when divided by 2.
- \(2.5\) is odd because it ends in 5 → odd numbers must be integers Only whole numbers can be odd or even; decimals and fractions are neither.
- odd \(\times\) odd = even → odd \(\times\) odd = odd The product of two odd numbers is always odd, e.g., \(3 \times 5 = 15\).
Where you'll use it next
Found in 5 StudyPug lessons
Draft Lisa Grade 3 Math placeholder
Learn to identify even and odd numbers using the last digit, pairing objects, and number line patterns, then practice with simple examples.
Grade 1 Math placeholder
Use a number line and skip counting by twos to quickly tell whether a number is even or odd.
Grade 1 Math placeholder
Learn to decide whether a group of objects is even or odd by pairing them up and checking for a leftover, with pictures and practice.
Grade 1 Math placeholder
See how splitting a group of objects into pairs of two shows right away whether the total is even or odd.
Grade 1 Math placeholder
Discover a fast way to identify a number as even or odd by looking at its last digit or by pairing up objects.
See also
Reviewed by Pat Cheng, M.Ed. — StudyPug Curriculum Lead · Last updated June 6, 2026