13.078
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13 + .078
78 = 2 * 3 * 13
Expressed as a proper fraction, this is equal to 78/10000. Expressed as a decimal fraction, this is equal to 0.0078.
The LCM of 13 and 78 is 78.
It is like adding integers, but like this: Example: 1.3 + 7.8 1.3 --> 13 + 7.8 --> 78 91 --> 9.1 First, you need to remove the decimals, then add that. At the end, you will have to make an educated guess as to where you should put the decimal.