Subtração Incrível do Mr Bean da Matemática 👨🏻‍🏫

[darrenward]

Ok, admittedly it works for these numbers
BUT
93-34
-1 from each leaves
92-33 which doesn’t help
So this method is ultimately useless most of the time.
Anyway you should be able to do this in you head or count on
34 to 40 is 6
40 to 90 is 50
Answer 56
If you can’t use these methods
Then his example is not going to help

[petermorhart]

90 minus 30 = 60 ... minus 4 ist 56. Im Kopf in Windeseile gerechnet

[ajjl]

Это за 1 секунду можно решить зачем париться?