Find odd: 2, 4, 7, 8.

**The reasoning** This question tests your understanding of **even and odd numbers**. An **even number** is any whole number that can be divided by 2 without a remainder (like 2, 4, 6, 8, 10...). An **odd number** cannot be divided evenly by 2 (like 1, 3, 5, 7, 9...). Let's check each: - 2 ÷ 2 = 1 (no remainder) → **even** - 4 ÷ 2 = 2 (no remainder) → **even** - 7 ÷ 2 = 3 remainder 1 → **odd** ✓ - 8 ÷ 2 = 4 (no remainder) → **even** So **7** is the only odd number in the group. **Why the wrong options tempt you** If you rushed, you might pick 2 because it's the smallest, or 8 because it's the largest. But the question isn't asking about size — it's asking which number is *mathematically different* (odd vs. even). **Quick takeaway** Even numbers end in 0, 2, 4, 6, or 8; odd numbers end in 1, 3, 5, 7, or 9 — just check the last digit!