Let's look at the overall picture. Does it make sense if you have a fifth of a pizza and add a half pizza, you get less than a third of a pizza.
Now, into the math.
Here is a fifth of a pizza.
Here is half a pizza.
It is hard to add these two.
We find the least common multiple of the denominators 2 and 5 and get 10.
Let's redo the pizzas in 10 slices.
And the half pizza.
Now with the same sized slices, we can add the slices and calculate the result.
Now we have seven slices out of ten, or 7/10.
Good luck.
Paul
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