The phrase "check the answer" is correct and a common usage in written English.
You can use it when you're asking someone to double-check the answer you have provided to a question. For example: "Please check the answer to make sure we got it right."
The diagnosis button is used to check the answer of the combination of sentence cards chosen by the learner.
The problem contained four items: "set up the function," "obtain the first derivative," "obtain the critical number," and "check the answer in the domain".
The questions contained six items: "set up the function," "obtain the function of one variable," "identify the concept of the critical numbers," "apply the critical number," "obtain the first derivative," and "check the answer".
Each worked-example and exercise problem contains four solution steps, including "set up the function," "obtain the function of one variable," "find the domain of the function," and "obtain the critical number and check the answer".
In fact, one of the things I try to drive home in intro classes is that it's often useful to use multiple approaches to a single problem as a way to check the answer.
OK, you've got my full attention now, Rob, and I think it's 2000, but actually can I just have a quick look on my phone to check the answer?
Perhaps even more disappointing, you can't check the answering machine from another room using a handset.
So imagine a college where students sit their exams unsupervised, take responsibility for timing them and for handing papers in afterwards and are trusted not to check the answers with a quick glance at the textbook.
Teachers check the answers through web interface, and get notifications of students who are consistently wrong.
