| 摘要 |
PROBLEM TO BE SOLVED: To increase calculation capabilities of pupils of the lower grades of elementary schools. SOLUTION: A calculation practice tool comprises a number display disk 1 and a quadrangular answer entry board 3 coupled with the number display disk relatively rotatably by a shaft part 2. Necessary numbers 5 are displayed on the number display disk 1 at peripheral parts in respective sections between division lines 4 dividing the disk equally and radially from the shaft part centering the shaft part, and cells 6 of a necessary number of rows and a necessary number of columns are displayed on the answer entry board. When one corner end 3 of the answer entry disk 3 is aligned with an arbitrary division line of the number display disk, the numbers at the peripheral parts of the number display disk meet the respective rows and respective columns of the answer entry disk; and numbers of the number display disk corresponding to the respective rows and columns are used for calculation and answers are entered into the cells at the intersection of the rows and columns. COPYRIGHT: (C)2006,JPO&NCIPI
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