Login to Learnyst as admin and go to Courses-->Tests Tab--> <Create New Test or Open and Existing Test> --> Test Builder and add section to your test.
To add numerical question to your quiz. Click on Numerical button to add to the section.
On clicking numerical question type, in your question builder you can see the answer text field to enter direct answers. Note: Answers should be in real number. ex: 25.25, -25.05