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Maths - random but useful links

Casio fx-85 series calculators show the answer as a fraction.  
to change the default display ... SHIFT+MODE  ?  1:MthIO  ? 2:LineO   should do it.
Trignometry link Nice to show where the values of sine and cos come from, in either degress or radians. From pHet 4 Star
Maths in Nature      
Is Math a Feature of the Universe or a Feature of Human Creation? YouTube. 9 mins. 4 Star
The Fibonacci Sequence in plants YouTube. 3 mins. SciShow 5 Star
Similar YouTube. 6 mins. ViHart 5 Star
Adding, subtracting, multiplying and dividing fractions YouTube. 10 mins. Watch it over and over until you know it. 5 Star
Notation for solving algebra problems From Mr Kendall's blog. Learn it! 5 Star
The history of calculus - clouded in controversy Link YouTube. 8 mins. Poor sound quality 3 Star
Instantaneous speed - shows how diffeentiation would work Link From surendranath.org  
Integration as area under a curve Link From surendranath.org  
A clever way to estimate enormous numbers   5 Star
Silly ways of remembering scientific notation 10^6 phones = 1 megaphone etc  
Online best-fit line graph Input data, see graph. Simple as. 4 Star
Online graphing calculator From desmos.com 5 Star
A collection of free online calculators Link From goodcalculators.com  
The problem with zero YouTube. 13 mins 5 Star
Equations that changed humanity How many do you recognise? 4 Star
Hans Rosling shows the best stats you've ever seen YouTube. 5 mins 5 Star
Wonderful site for showing data on causes of death From healthmetricsandevaluation.org  
Constructions With videos  
Integration - nice simulation of the area under a curve