Matrix Multiplication

When I teach matrix multiplication I respect that pupils tin expire a fighting lost inwards their calculations.  I constitute a fantastic novel method on this blog.

Let's tell nosotros convey matrix A together with matrix B.  We desire to calculate AB.  Write downwards the 2 matrices side-by-side.  Then move matrix Influenza A virus subtype H5N1 down. Now write your answer inwards the infinite at the bottom right.  I intend the adjacent measurement is self-explanatory from the film below, merely read the master copy blog post for a amount explanation.

I beloved this method - it's together with then unproblematic to retrieve together with instantly virtually impossible to expire lost when multiplying matrices.

And - on the dependent area of matrices - this made me chuckle:

A Percentages Trick

Just a quick post service today to portion a groovy tip:

You tin rate notice swap the per centum as well as the amount:  16% of £25 is hard to calculate inwards your head, just 25% of £16 is exactly the same amount.

So if you lot desire to speedily function out 16% of £25 without a calculator, honour 25% of £16 instead (ie split £16 past times 4). Simple!

Think most why this works.

Source: www.aperiodical.com

Multiplication As Well As Colour

This uncomplicated persuasion shows how of import it is to role unlike colours when writing on the board - no affair what topic you're teaching.  It actually helps pupils decease along rails of what you're doing.

Source: http://www.jandmranch.com/2013/02/09/teaching-three-digit-multiplication-to-my-aspergers-daughter/