One Minute Math Subtracting Fractions With Cross Multiplication

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RobertPrestwidge Equation
RobertPrestwidge Trigonometry
RobertPrestwidge Fraction
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The techniques of 'Cross Multiplication' is not known by many. It is very quick and easy to use, even with high-level Algebra. I have found it to be soo helpful for many students from those who are very weak at fractions, through to the very capable students.

People have been asking me to make very short videos - hence 'One Minute Videos'. It was interesting giving myself an absolute limit of one minute and the challenge was trying to find a balance between being able to go fast but not 'too fast'. It was a load of fun and it will be interesting to see how I develop with this.

I hope that it brings a smile to your face and it is enjoyable and really helpful. I wish I had these when I was a child. :)