Yes, 3つの数のたし算とひき算が学べる「もっとかずのトライ」(小学1年生向け算数) is completely free and it doesn't have any in-app purchases or subscriptions.
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3つの数のたし算とひき算が学べる「もっとかずのトライ」(小学1年生向け算数) is free.
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