What Are Even and Odd Numbers?

• Every number tells us how many things are in a group.
• We can find out if a number is Even or Odd by trying to give every item a partner.
• Thinking about "best friends" or "pairs" helps us understand these numbers easily.

Even Numbers: Everyone Has a Partner

• An Even number is a number that can be split into pairs (groups of two).
• In an even group, every single item has a partner or a "best friend."
• No one is left out or standing alone.
• Even numbers always end in: 0, 2, 4, 6, or 8.

Odd Numbers: Someone Is Left Out

• An Odd number is a number that cannot be split perfectly into pairs.
• In an odd group, after we make all the pairs, there is always one left over.
• One item is "odd man out" because it doesn't have a partner.
• Odd numbers always end in: 1, 3, 5, 7, or 9.

The Buddy Test

• To check a number, imagine the items are children lining up for a walk.
• If every child has a buddy to hold hands with, the number is Even.
• If one child has no buddy to hold hands with, the number is Odd.

Examples in Daily Life

• Even: Your shoes (2), the wheels on a car (4), or the legs on a spider (8).
• Odd: The nose on your face (1), the points on a star (5), or the colors on a traffic light (3).

Lesson Summary

• Even numbers make perfect pairs with no leftovers.
• Odd numbers always have one item left over without a partner.
• Looking at the last digit of a big number helps us tell if it is Even or Odd instantly.