A reference book containing past problems from the Arithmetic Olympics from 2011 to 2020. - Title: Arithmetic Olympics Past Problems Collection 2021 - Target Age: Elementary and Junior High School Students - Included Years: 2011-2020 - Organizer: Arithmetic Olympics Committee - Problem Format: Past exam questions - Cover Design: Rainbow gradient - Number of Problems: 20th to 29th Arithmetic Olympics, etc. Thank you for viewing. Brand new, unused. No writing inside. Stored at home. Thank you for your understanding. Please consider purchasing.