511: Factory Ratios 2

We started with this:

In a factory, the ratio of men to women is 2:3.
The ratio of right-handed men to left-handed men is 7:3
The ratio of right-handed women to left-handed women is 11:1
What fraction of the factory workforce is right-handed?

But let's extend things a bit.

What is the fewest number of employees possible in this building?

Source:

New GCSE Maths question: Ratio and proportion is the buzz thing! How are your students going to tackle it? pic.twitter.com/RyPsmc9z4m

— m4ths.com (@m4thsdotcom) December 16, 2015

436: Whiteboards at NCTMBoston

Found this in the #NCTMBoston exhibit hall. What questions do you have? #mathchat
— David Wees (@davidwees) April 17, 2015

178: Hexagonal Densepack

What is the best way to find the perimeter of the rounded hexagonal shape, i.e., the length of the belt that would wrap around the six wheels?

r = 1

81: It's Irrational for pi to be Irrational

"Why do we call pi irrational when it's clearly the ratio of a circle's circumference to its diameter?" - Indira Gil.

74: The One where we discuss Size.

After we laugh at the joke,

Consider:

Here is the NPR discussion on this.

63: Who's Better at Doodle Jump?

Dan might not even remember this ...

How many different ways can you compare these two to decide that Dan is better?

How many different ways can you compare these two to decide that Mike is actually better?


Posted years ago by @ddmeyer

I think my pre-algebra came up with seven different ways to decide. 

57: 10,000 Random Dots.

To repeat the experiment, refresh the page or ...
Do it Again.

Your browser does not support the HTML5 canvas tag.

What are we looking at, here?

Feel free to steal the code. I converted to javascript from the Original python code by @rjallain.

46: The Dinosaur Bone

What questions does this image bring up?

What part of the dinosaur is that?

How big was it?

What measurement system are we using?