The curd where 99 calculation is easy to remember.

摘要

Divisions In order to be understood to be able to understand 99 of multiplication of the elementary school student more easily, the curd set which devises in the curd is offered.SolutionsYou prepare 99 curd of each column, the vertical N column, you make the mass of side 10 steps in each curd according to that N column, 1st in step insert the number of N columns into each mass, from 1, 2nd in step from 1+N 2N, 3rd in step insert the digit of 3N and the like from 1+2N, the N column eye that try it becomes the answering of 99 calculation of the N column. Choice figure Drawing 1