The following image was made from Add with Lines Designer:
You will notice that the addends 1/5 and 1/2 have unlike denominators. You must first rename 1/5 and 1/2 with a like or common denominator(LCD). The program COMPARE FRACTIONS shows how to find the LCD. In this case, each addend is written with a common denominator 10.
Once each addend is written with like denominators, the numerators may be added for the sum numerator.
The program ADD FRACTIONS - EASY shows how to add fractions with like denominators.