The simplest is to convert both into the same form. Whether you choose to go for two decimal numbers or two fractions is a matter of personal preference. Add the two parts together and you have your estimate.
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6.9 or 69/10
39 is a whole number as in not a fraction or decimal.
0.4 as a fraction and decimal
No, the sum of a repeating decimal and a terminating decimal is never a terminating decimal.
A decimal number is one in which the place value of each digit is ten times the place value of the digit to its right. (... , thousands, hundreds, tens, units, tenths, hundredths, ... ) A decimal point is used to separate the units from the tenths. If a number in decimal form has non-zero digits after the decimal point then it is a decimal fraction. [There is one esoteric exception: if the decimal point is followed by an infinite string of 9s, then it is not a decimal fraction.] Thus 37.6 is a decimal fraction 0.6 is a decimal fraction 0.00000063 is a decimal fraction 37 is not a decimal fraction. 37.0 is not a decimal fraction. 37.999... recurring is no a decimal fraction [it is in fact = 38].