Answer:
0.04444444444
but if you want to round to nearest tenths place its 0.1
Explanation
multiply 4 by 5 =20.
Then we multiply 2 by 9=18 to get donaminater times the demonimaters by each other 9 times 5 which equals 45 so now you have 20/45 -18/45 then subtract sence denominaters are the same they stay the same nuber 20-18 =2
2/45 and 2/45 as a decimal is 0.04444