decimal arithmetics--gre

Hello group.

I was looking through GRE book and found the following problems

100.26/1.2

and

(0.087)(0.00021)

Are there a lot of people who can still do this kind of arithmetics? if
so what's the trick?

The amount of arithmetic expected is ridiculous. I haven't been able to
do things like that since grade school.


Thanks for any ideas

.

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