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13 Grade School Math Problems Most Parents Can't Solve

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Are you smarter than a fifth grader? No, we're not offering a cash prize if you can prove it. But after struggling with these "easy" math questions we'd like to see how many you can solve.

We promise you don't need a calculator for any questions, but keep a pencil and paper handy because the answers are on the last page!

1. Let's start simple

A study in Japan found that 60% of people in their 20s got this question right, compared to 90% of older generations. We're not sure what being a millennial has to do with math, but see if you can solve this equation.

Mind Your Decisions

2. What's the ?

The aim of this puzzle is to solve what number is in the ? space. Yes, it's really that simple. And no, we can't give you any other clues.

3. The bat and the ball


This is an oldie but a goodie:

A baseball bat with a ball costs $1.10. The bat cost $1 more than the ball. How much does the ball cost?

4. Let's Make a Deal

Damn Interesting

You're competing on a game show where there are three doors. One door is hiding $1 million, the other doors are empty.

You pick door #1. The host opens door #3 and reveals that it is empty. He asks you if you want to keep door #1 or switch to door #2.

Which is the best answer?

5. Here's a head-scratcher

Take a look at this equation and see if you can solve it:

What's the answer?

6. Lily pad logic


There's a lake with a patch of lily pads growing on it. Every day, the patch doubles in size. If it takes 48 days to cover the whole lake, how long would it take to cover just half of the lake?

If those aren't tough enough we have more questions, and of course the answers are on the last page.

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