正方形を追加して図形を作っていくと，数がどんなふうにふえていきますか？
下に出てくる数を見ながら，きまりを見つけてみましょう．
- Resource Type
-
Activity
- Tags
-
- Target Group (Age)
- 10 – 19+
- Language
- Japanese / 日本語
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