Book review

I'm reading a book called 'codes how to make and break them' I'm about half way through the book and so far I've learned about some kinds of codes and how to 'make and break them' I recommend this book because it teaches and entertains.

Basic ratio knowledge

In maths we've been working on ratios and I've learned a little bit I would like to show you it is some of the most basic ratio knowledge but who knows you might learn something

Basic ratios