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Fast ways to do Arithmetic mentally

RedAlert
in Mathematics

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32*39

=32*(40-1)

=1280-32

=1280-30-2

=1250-2

=1248

 

5032-1098

=5032-1000-90-8

=4032-90-8

=4032-100+10-8

=3932+10-8

=3942-8

=3934

 

Ok...some of the steps are ridiculous but it's sometimes easier :)

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