source:

```
Old Exam Questions #2 : My solution in a few days...
http://t.co/VDHpuoDY5a pic.twitter.com/OFpD7AT6G4
— solve my maths (@solvemymaths) May 24, 2015
```

180 Days of Ideas for Discussion in Math Class. (as of 9July2014, we're in overtime!)

That's pretty much it: How many Geometry Theorems are needed to solve this extended problem?

source:

source:

```
Old Exam Questions #2 : My solution in a few days...
http://t.co/VDHpuoDY5a pic.twitter.com/OFpD7AT6G4
— solve my maths (@solvemymaths) May 24, 2015
```

We all recognize the Fibonacci Sequence: 1, 1, 2, 3, 5, 8, 13, 21, ...

What is the units digit of the sixty-first Fibonacci number?

Is there a pattern?

What is the units digit of the sixty-first Fibonacci number?

Is there a pattern?

```
1,1,2,3,5,8,13,21,... What is the final digit of the sixty-first Fibonacci number?
— James Tanton (@jamestanton) May 24, 2015
```

Normally, I'm glad when the nedia talks about math, even if it is simply the latest "Super-Hard problem from Asia that All of Us Stupid American Adults and Brits Won't be Able to Solve but Their 8 Year-old Do Routinely."

Throw in "I gave it to a mathematician and he couldn't solve it either" and you've got an instant viral hit, apparently.

All right, rant over.

What's the error?

Oh, and solve it if you want, too. It's not really that hard.

Further questions:

source.

(answer linked from there)

Throw in "I gave it to a mathematician and he couldn't solve it either" and you've got an instant viral hit, apparently.

All right, rant over.

What's the error?

Oh, and solve it if you want, too. It's not really that hard.

Further questions:

- Which blanks CANNOT have a prime number in them?
- Which blanks COULD have certain prime numbers?
- Which blanks essentially force this problem to be non-unique?

source.

(answer linked from there)

This graph needs a lot of work.

What information is being presented?

What is the best way to display this information?

Does this graph rely too much on the reader's knowledge of the city?

source.

What is the area of the whole hexagonal shape?

Can your students generalize this result?

Source:

```
Farmer has 3 square fields & 4 triangular fields. What is the entire area of his estate? http://t.co/R8IyU2iyYF pic.twitter.com/3yEdcBrw3N
— Cliff Pickover (@pickover) May 19, 2015
```

Take a square number and multiply by four. Is it guaranteed to still be a square number?

Can we generalize this rule?

Can your students explain why?

Source:

Can we generalize this rule?

Can your students explain why?

Source:

```
Subitizing Series #5:
These Dots Will Grow on You
http://t.co/MWtwbjb9eG
Is every sq. # ×4 another square # #mtbos pic.twitter.com/IxwBXCaOGS
— Steve Wyborney (@SteveWyborney) May 18, 2015
```

You've all seen Plinko and its variations. Here's one:

This one has a normal curve drawn on the background. Should it be a normal curve or more triangular like the arrangement of the pins?

Would it still be in this shape if the pins were arranged in a rectangle?

This one has a normal curve drawn on the background. Should it be a normal curve or more triangular like the arrangement of the pins?

Would it still be in this shape if the pins were arranged in a rectangle?

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