Answer:
He multiplied the whole numbers and divided the fractions
Explanation:
3 1/2 ÷ 5 4/9
change the mixed numbers to improper fractions
3 1/2 = (2*3 +1)/2 =7/2
5 4/9 = (9*5+4)/9 =49/9
7/2 ÷ 49/9
copy dot flip
7/2 * 9/49
rewrite
7/49 * 9/2
1/7 * 9/2
9/14