It is designed so that you can check the answer immediately by [question ⇒ answer] for each question.In addition, since the problem sentence is also written on the answer page, it is easy to review the problem.The questions are the same pattern every year, so lets start learning little by little on your mobile phone or tablet.*Since questions 1 to 10 have many calculation problems, they are divided separately for easier study.* Problems 31 to 50 are excluded because they are difficult to display on mobile screens.* We have collected problems that are easy to learn in the gap time of problems 11 to 30.*It is recommended to use problems 1 to 10 in an environment where you can memorize them while writing them on your desk. There are some calculation problems that are not too difficult, so please do your best without giving up.*2nd half of 2020 morning/afternoon, 2021 first half morning/afternoon, 2021 second half morning/afternoon, 2021 first half morning/afternoon, 2020 second half morning/afternoon, 2019 1st half/second half, 2018 first half/second half, 2017 first half/second half, 2016 first half/second half, 2015 first half/second half, 2014 first half/second half, 2013 first half/second half, 2012 first half / Second half, 2011 first half / Second half, 2010, 2009is included.