Classic brain training methods are perhaps puzzles like crosswords or sudoku, but in recent times I have become more and more attracted to the type of challenge you’ll see below.

This types of puzzles have been flooding the web lately, probably because they are really fun!

These are old classic mathematical problems. When you were in middle or high school.

These tests are more fun when you find yourself trying to remember the math you learned as a child.

**Can you figure out the solution for this mathematics quiz – without a calculator?**

Okay, now onto the challenge itself.

In the picture below, we see a mathematics problem made for middle schoolers.

The challenge: are you able to solve it without a calculator?

Remember the order of operations. What part should you solve first?

Think about it carefully so you answer correctly!

Below the next picture, you will find the correct answer.

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**Here’s the answer.**

The correct answer is 11.

How do we know that 11 is the right answer?

To begin with, we need to solve the part inside the parenthesis, 12 ÷ 4 + 1, which equals 4.

After that, the problem looks like this: 15 – 1 x 4. So the next step is to calculate the multiplication, that equals 4.

So the problem now is 15 – 4, which totals 11.

The answer is then 11.

Did you get it right? Congratulations!