7の倍数はね,位を2つさげて2倍して,消えた2桁を足し合わせて7の倍数なら7の倍数だよ2023→40+23→63→7の倍数!
7の倍数はね,位を2つさげて2倍して,消えた2桁を足し合わせて7の倍数なら7の倍数だよ2023→40+23→63→7の倍数!
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