Question

Could someone help me with number sense imma post the picture below​

Answer 1

3* (1/3)= 1

4* (1/2)= 2

7* (3/7)= 3

14* (4/14)= 4

20* (1/4)= 5

(1/2)* 12= 6

(1/7)* 49= 7

18* (4/9)= 8

90* (1/10)= 9