Why? MATEMATIK. BUKU 1 - Kim, Yoo Soo; Kim, Hong Sung; Mastura Abd Basar; Noor Shahariza Nordin (Petaling Jaya, Selangor : Orbit Buku Sdn. Bhd., 2017)
Includes questions and answers
Keywords: Mathematics -- Problems, exercises, etc; Arithmetics -- Study and teaching; Comic strips