0
its called using your brain or the calculator or internet explorer but you can use a method
e.g:
156x321
100 50 6
300 30000 15000 1800 then add all of this row together except from the 300
20 2000 1000 30 add all of this row together except from the 20
1 100 50 6 add all of this row together except from the 1
then add all of them together and then thats what your answer will be
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