Check out a free preview of the full Calculator Project: HTML & CSS course:
The "Finishing Rows Exercise" Lesson is part of the full, Calculator Project: HTML & CSS course featured in this preview video. Here's what you'd learn in this lesson's course:

Students are instructed to add the rest of the number button rows into the calculator as an exercise.

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Transcript from the "Finishing Rows Exercise" Lesson

>> Jen Kramer: So what I'd like for you to do now, go on ahead and take a minute or two. And I'd like for you to go ahead and code the four, five, six, minus row and the one, two, three, plus row. Go ahead and code those two rows now.

Go on ahead and write the code for that. Once again, there's not a whole lot to see once you're done coding it. It'll look kind of like that, vaguely like a calculator.