# Category:Educational

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## Subtraction Trick – avoid the borrowing! Easy maths lesson.

It is easy to avoid borrowing when you are subtracting if you minus by pairs of digits rather than individually.

## Mental Math Tricks – How to multiply in your head!

How can you multiply in your head? Mental maths is easy - using this trick to reprogram your brain

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## Janet

Janet, by School House Rock!

## Percentages of an amount – fast math lesson

This video looks at the way to easily work out percentages of any amount. This is an essential part

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## DSN Animations: How do Musical Strings Work?

This Design Squad Nation animation shows how the frequency at which a string vibrates—its pitch—is affected by its length, tension,

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## Fast Math Trick – How to multiply 2 two digit numbers – why it works!

This video looks at how the video on multiplying two digit numbers rapidly works, as well as looking at where

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## Top Builder: Newspaper Power | Design Squad

http://pbskids.org/designsquad/topbuilder/6/ Design and build your own sturdy structure out of newspaper and masking tape! You can build

## DSN Animations: What are Design Differences?

This Design Squad Nation animation shows two steering systems—a rudder and a set of fans—and watch how each one utilizes