Another way to rewrite 8 2/4 is by converting this mixed number into an improper fraction.
Simply multiply the denominator (the bottom number of the fraction) by the whole number (in this case, 8) and then add the product by the numerator (the top number of the fraction).
Your answer should be 34/4 and this could be simplified to 17/2 by dividing both the numerator and denominator by its GFC (greatest common factor), 2.