Hannah Fry should be the goto source for anyone who wants to understand the importance of maths in the modern world and its use in ToK. Hello World, her book about algorithms and AI is a must read for ToK students who wish to do anything on Maths for their assessment.

I have included a few links here to some Ted talks and other various videos that have an insight into ToK and maths. There is so much more to explore and plenty to use in ToK, but start with watching these videos and then look into reading her books.