4.45
The LCD for 3/20 and 9/4 is 20
(4/9) * (5/9) = 20/81
4/9 = 20/n 4n = 9(20) 4n = 180 n = 45
9 over 20. 9/20
20 over 36 simplified is 5 over 9.
7/20 + 9/10 = 7/20 + 18/20 = 25/20 = 5/4
15/20 or 3/4
4 over 9
15/20 - 6/20 = 9/20
equivalent fraction for 20 over 45 = 4/9
25/20 or 1 and 1/4
4/9 ÷ 11/5 = 4/9 x 5/11 = 4x5/9x11 = 20/99