算願:比を簡単にしよう1 なまえ . 20 : 4 =
5 : 15 = 12 : 16 = 9 : 15 = 20 : 8 = 12 : 15 = 16 : 8 = 5 : 20 = 8 : 4 = 12 : 3 = 12 : 4 = 3 : 12 = 20 : 12 = 12 : 9 = 4 : 16 = 10 : 6 = 20 : 4 = 10 : 4 = 8 : 12 = 12 : 15 = 16 : 4 = 10 : 20 = 8 : 10 = 8 : 20 = 15 : 25 =
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