Here’s a deceptively simple math brain‐teaser: divide 30 by ½ and then add 10. Many jump straight to 30 ÷ 2 = 15, then 15 + 10 = 25—yet that’s the classic trap. The real trick? Dividing by one‐half is the same as multiplying by two! So the correct calculation is 30 × 2 = 60, plus 10 equals 70. Ready to test your friends and prove your mental math prowess? Dive into this puzzle, avoid the common pitfall, and see if you can beat the odds!
What’s the Answer Here?
Here’s a deceptively simple math puzzle for you:
Divide 30 by 1/2 and add 10. What’s your result?
Take a moment to calculate it in your head before reading on. Be honest—did you instantly say 25, or did you stop to think twice?
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Common Pitfalls
Treating “divide by ½” as “divide by 2”
- Many people see “÷ 1/2” and mistake it for “÷ 2,” which leads to 15 + 10 = 25.
Skipping Order of Operations
- Some rush through “add 10” before handling the division, causing confusion in the steps.
Overlooking the Reciprocal Rule
- Dividing by a fraction means multiplying by its reciprocal—an easy rule to forget under pressure.
Step‐by‐Step Breakdown
Divide 30 by ½
- Dividing by one half is the same as multiplying by two: 30 ÷ ½ = 30 × 2 = 60
Add 10
- Now simply add ten: 60 + 10 = 70
So the correct answer is 70, not 25!
Keep the Fun Going
Did you get 70 on your first try, or did you fall into the “25” trap? Share your result below, and challenge a friend to beat your speed. If you love puzzles that twist simple rules, explore more of our brain-teasers to sharpen your mind and have some fun!
