This site introduces problems of Sansue, i.e. mathematics which Japanese schoolchildren learn at elementary school. Problems are selected mainly from entrance examinations of famous junior high schools for 6th grade Japanese schoolchildren (12 years old) to take. We found Sansue is not only one of subjects at school but one of Japanese culture. Please enjoy Japanese Sansue culture.
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II.13 Sequences on a certain rule
As shown in a figure, the number is arranged under a certain rule.
Answer the following questions.
(1) Find the 10th number from the left in the 1st level.
(2) As for 32, find the number of level and the number counted from the left.
