Calculate four 10ths plus five 10ths.
Here we have like fractions because they have the same denominator. So it’s quite simple to add them together. In order to add four 10ths and five 10ths together, we keep their common denominator of 10. And then on the numerator, we add four and five. So for our numerator, four plus five is nine. And we keep the common denominator of 10. Therefore, our final answer is nine 10ths.