Question

30 POINTS A student answered the question, 3 1/2 ÷ 5 4/9. He got the answer 15 9/8. What did he do wrong.

Answer 1

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