If you are doing it with a calculator:
<em>1.</em> The answer is 78
If you are doing it by hand:
<em>1</em>. Add the tens first, which is 18.
<em>2.</em> Then move the the 1 from the 18 over to the tens place.
<em>3. </em>Add up the tens place with the 1, which is 7
<em>4.</em> All together the answer is 78