A) at
B) in
C) to
D) on
🧠 Explanation:
The phrase “He is quick at mathematics” means someone is fast and good at math. The word “at” shows their skill in a subject. Picture a kid solving puzzles super fast, like a math superhero! Being quick at math helps with schoolwork, games, or shopping. For kids, it’s like being great at a favorite game. Using “at” makes the sentence clear. Learning this helps children understand how words describe talents, encouraging them to practice math to become quick too, making it fun to solve problems and share their skills with friends.
