Odd and Even Numbers

🎯 What Will We Learn Today?

Numbers come in two flavors: odd and even! Today we'll learn how to tell them apart and discover some cool patterns they make.

📚 What Are Even Numbers?

Even numbers can be split into two equal groups with nothing left over. They end in 0, 2, 4, 6, or 8.

2: one pair ✨

4: two pairs ✨✨

6: three pairs ✨✨✨

8, 10, 12, 14, 16, 18, 20...

Think of it: Even numbers are like pairs of shoes — every shoe has a partner!

📚 What Are Odd Numbers?

Odd numbers CANNOT be split into two equal groups — there's always one left over. They end in 1, 3, 5, 7, or 9.

1: one alone 🧦

3: one pair and one left over 🧦🧦

5: two pairs and one left over 🧦🧦🧦

7, 9, 11, 13, 15...

Think of it: Odd numbers are like socks — sometimes there's an unmatched one!

🎮 Quick Tricks to Tell Odd from Even

Trick 1 — Look at the last digit:

Ends in 0, 2, 4, 6, 8 → EVEN

Ends in 1, 3, 5, 7, 9 → ODD

Trick 2 — Pair them up:
Try grouping dots into pairs. Any dot left over? Then it's odd!

🧮 Odd and Even Patterns

| Adding | Result |
|--------|--------|
| Even + Even | Even（2 + 4 = 6） |
| Odd + Odd | Even（3 + 5 = 8） |
| Even + Odd | Odd（4 + 3 = 7） |

| Multiplying | Result |
|------------|--------|
| Even × Anything | Even（2 × 3 = 6） |
| Odd × Odd | Odd（3 × 5 = 15） |

📝 Practice Problems

Is 14 even or odd? How do you know?

Is 27 even or odd?

What is the next even number after 18?

Add an even and an odd number. Is the sum even or odd? Test with 6 + 3.

Can you find an odd number that ends in 0? Why or why not?

🎮 Play a Game!

Practice math patterns with Island Chase!