Comparative calculation techniques

Much simpler... and less steps. Don't have to break down into multiple problems. Don't have to draw lines and count intersections. Just solving the problem as it was presented. 31x12

Me

I learned to do it this way (except not writing with a mouse in Paint):

Smart woman.

It had to be done

The physics of soap bubbles freezing in a mesmerising way

30*12=360 360+12=372 This is Turkish technic

Train drivers POV after heavy snowfall is pretty insane! 😲

For ex 89x94 carried out with the Japanese method becomes much more complex and time-consuming..

Teaching these tricks to children is very important, children must not only memorize things but understand them.