By finding their common denominator & adding the top numbers of-the fractions. : )
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Yes, you can.
Rational and Irrational Numbers
The result will also be a rational number.
You can not add irrational numbers. You can round off irrational numbers and then add them but in the process of rounding off the numbers, you make them rational. Then the sum becomes rational.
All fractions are rational numbers because irrational numbers can't be expressed as fractions