I was a little confused by your question. 

If you mean what is the sum of 123 and 0.2321 then I would perform an addition. I would put the two numbers on top of each other, making sure that I line up the decimal points of each number and I would then add each column to give the result. 

The result of addition is 123.2321

If you mean what is the product of 123 by 0.2321 then I would perform a multiplication. I would break the multiplication down into three simpler multiplications and then add up the three results to give the final result. The calculation is shown below:

3 lots of 0.2321 = 0.6963
20 lots of 0.2321 = 4.642
100 lots of 0.2321 = 23.21

When the three answers are added together the result for the product is 28.5483

If you mean what is the result of dividing 123 by 0.2321 then I would perform a division. There are two methods available. You could either use long division or you could divide 1 by 0.2321 and then multiply the result (4.30848772) by 123 which gives the result for division of 529.94399
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