Because you have to know the paper ratio, size, thickness, etc.,
read origami design secrets by Robert lang (especially the last chapter)
Origami is part of geometry
math is involved in everything
In folding at angles and creating triangles you are using trigonometry and geometry.
There are a number of online sites where one can get directions on how to make an origami star. Basically, there are 19 steps involved and these are outlined and demonstrated at Origami Instruction as well as on several YouTube videos.
I believe that some cool projects are - Math in Chess Math in Probability Pascal's Triangle Serpinski's Triangle Math in Origami Binary Computer Coding Math in Magic Math in Music These are good topics.
Simple instructions such as 'repeat four times' - if you don't understand maths, you cannot know if you've repeated the required number of times. I've not done any origami for years !
no math involved
The only way math could be involved in barrel racing is if you look at it using physics.
There is no such thing as 'Mormon math'. Mormonism is a religion, and there is no math involved.
Mathematician
Soccer is involved in math because to keep score
Where can you get origami diagrams that will allow you to do super advanced origami when i have already started the origami and I am good but not good enough to make up your own origami?
computers, cars and well everything has math involved in it somehow, math is the basis for all we know and do