File:Study of calculation by Fudetaro Suzuki.jpg
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日本語: 鈴木筆太郎が1907年に考案した算数教具「別子教数器」を簡略化した「折りたたみ教数盤」を小野健司が復元したもの。5個ずつ2段になっている。黒い面を児童に見せる。裏面は白くなっている。そこから裏に折ってある白い正方形を黒い面に出して1～10を数える。10を裏返すと一つの白い長方形となり，「10でひとまとまり」という位取りをイメージさせる。 |
| Date | |
| Source | Own work |
| Author | 山本海行 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 03:42, 30 April 2020 | | 818 × 2,031 (202 KB) | 山本海行 (talk | contribs) | Uploaded own work with UploadWizard |
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