Хотя математика сложная, мне легче решать задачи утром.

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Breakdown of Хотя математика сложная, мне легче решать задачи утром.

• сложный: difficult
• хотя: although
• утром: in the morning

Questions & Answers about Хотя математика сложная, мне легче решать задачи утром.

Why does the sentence start with Хотя, and what does it require grammatically?

Хотя means although / even though and introduces a concessive subordinate clause. In Russian it typically:

• takes a full clause with a finite verb (often implied есть in the present tense), e.g. Хотя математика (есть) сложная...
• is followed by a comma separating the subordinate clause from the main clause when the subordinate clause comes first: Хотя ..., ...

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Why is there a comma after сложная?

Because the clause Хотя математика сложная is a subordinate clause introduced by Хотя. When it comes before the main clause (мне легче решать...), Russian punctuation normally requires a comma between them:

• Хотя [subordinate clause], [main clause].

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Why is it математика сложная and not математика сложна?

Both are possible, but they’re slightly different in style:

• математика сложная = literally “mathematics is difficult” using an adjective in the full form, common in neutral spoken/written speech.
• математика сложна = short-form adjective, often more bookish, formal, or “statement-like.”

So сложная is a very natural everyday choice.

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