Sansue = Japanese Math for Kids 「英語で算数」

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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Math Problem (Level 1) : Divided by 4 and 5 (G2)

Among the numbers of which remainder is 2 when it is divided by 4, and is 3 when it is divided by 5, what is the largest number of two-digi...

Math New Drill (Level 1) : Number sense and theory Three fractions multiplied by a same fraction

Three fractions 28/3, 35/6, and 77/8 are multiplied by the same fraction and each product becomes to be integer. Find the fraction mo...

Math Problem (Level 3) : Tape winded around rectangular board (JJJ15)

As shown in a figure, there is a translucent red tape in which the end is cut at 45 degrees and there is a line drawn in the center of the ...

Math Problem (Level 1) : Fraction can not be reduced (G1)

How many fractions are there which cannot be reduced to its lowest numbers among 1/45, 2/45, 3/45 -- 44/45 ?

Math New Drill (Level 1) : Number of cases Point moving on the side of a square

There is a square ABCD whose length of one side of is 1. First, the point P is in the position of A. When I throw one coin and h...

Math Problem (Level 3) : Right dodecagon (JJJ14)

Answer the following questions about a right dodecagon. (1) Find the number of a diagonal line. (2) Write in all the right dodecagons that ...

Math Problem (Level 1) : Questionnaire to 41 students (F7)

I took a questionnaire to 41 students. There were eight students who drunk milk and 28 students who ate bread this morning. Find the leas...

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