算願:比を簡単にしよう1 なまえ . 10 : 20 =
12 : 15 = 10 : 4 = 6 : 12 = 20 : 8 = 8 : 10 = 12 : 3 = 12 : 20 = 6 : 2 = 20 : 8 = 6 : 4 = 8 : 4 = 4 : 6 = 6 : 3 = 8 : 12 = 12 : 6 = 4 : 12 = 10 : 8 = 9 : 15 = 8 : 4 = 15 : 3 = 20 : 12 = 8 : 4 = 15 : 3 = 2 : 6 =
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