Title: Fast Maths Trick of Calculation
Resource type: Video
Link: http://www.youtube.com/watch?v=hLdKsKep1og
Reason for recommendation: Even though this only works with multiples of number less than 20, it is very useful because we are too reliant on calculators many times. With this, calculation in Maths Olympiads will be much easier too and they can have fun conquering the "difficulties" of maths.
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