Trucos matemáticos

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5y
How to Multiply by 9 Using your Fingers — The Burlap Bag
I don't think i ever knew this... i always used the (ex. 9x3= the number below the # being multipled by 9 .. like 2 then the second number is whatever is added to get 9 ... answer 7)... hope that makes sense lol :)
Math Made Easy – Multiplication Made Simple
Math Made Easy – Multiplication Made Simple
How to math like an asian - FunSubstance
Multiplica como los japoneses!
If You're Bad At Math, It's Because You Didn't Learn These 11 Simple Tricks
If You're Bad At Math, It's Because You Didn't Learn These 11 Simple Tricks
¡Cuánta razón! Era necesario plasmarlo en un cartel
¿POR QUÉ? - ¡¿Por qué no nos enseñan esto en el colegio?!