objects are wrong size

i using illustrator cs5 on macbook pro running 10.9.1. when make new objects dimensions not precise, although using application bar spec sizes. when use built-in calculator function resize objects, errors grow.

 

 

for example:

rectangle, 7" x 10", intended size. result: 7.0124" x 10.1251". rectangle has no fill, rule 1'.

 

 

when use calculator make 1/9 of intended size, result should 0.7778" x 1.111". instead, result 0.0.7653 in x 1.108 in.

 

 

what in world wrong? , how can fix this?

 

 

thanks,

nicky

nicky,

 

such funny values either caused align pixel grid (in transform palette) or edit>preferences>general>show preview bounds.

 

however, figures seem different either.

 

but can have look.

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