Calvin hates homework. He tries to find ways to avoid it, or provide excuses for his incomplete assignments. If he does happen to do it, then he usually writes preposterous answers. Calvin's parents often express concern for their son's lack of effort.
From dinnertime to his later-hour TV, a span which lasts half an hour or so, Calvin is in "homework time" (Calvin's parents eventually made homework time last from dinnertime to bed) in his room. He usually assigns his work to Hobbes despite the poor job he does. Although Hobbes has the goodwill to do so, his answers are preposterous, possibly deliberately.
Otherwise, Calvin has also dodged homework by turning into Stupendous Man and turning back time, using "efficient" time management, or even bargaining with Galaxoid and Nebular. When Calvin could not complete his homework, he made up absurd excuses such as his school supplies eating each other or the gravity in his house being offset.
Calvin is notably inept at the mathematic portion of his homework. He struggles with the most rudimentary addition and subtraction problems, due to flawed logical thinking and a lack of effort. He will often overcomplicate simple operations (at times with imaginary math tools and principles) or write down unrelated answers such as "Atlanta, Georgia" to problems.