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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JJJ.17 Triangle covered by squares

As shown in a figure, the right triangle was covered with the square tile 10 cm in one side.
Find the least number of sheets of tiles required to cover a right triangle with sides of length 3 m and 4 m in the same way.