We need to add 1/4 + 2/5. Remember that the denominators have to be the same to add. The LCM of 4 and 5 is 20. 1/4 = ?/20. Since 4 x 5 = 20, 1 x 5 = 5, so 1/4 = 5/20. 2/5 = ?/20. 5 x 4 = 20, 2 x 4 = 8, so 2/5 = 8/20. 5/20 + 8/20 = 13/20, which is your final answer! Hope this helps!