why do they move the decimals when multiplying
no.
Fractions and decimals are usually rational numbers. Besides, multiplying rational and irrational numbers is also similar.
Yes.
0.0232
Very.
There is no difference in the procedure.
adding subtracting multiplying and dividing
No, it is not necessary. But it does help to be tidy.
Please see: Multiplying decimals
In price tags, Doces of medicine, Taxes, Adding, Subtracting, Multiplying, Division, Averages, Measurments, Weight.
Either you can, or you can't! It is perfectly valid to use decimals in the top or bottom. Now, if you want whole numbers, you can convert the fraction to an equivalent fraction, multiplying top and bottom by 2 in this case.