10.to_s.split(//).map{|s| %w(０ １ ２ ３ ４ ５ ６ ７ ８ ９)[s.to_i]}.join #=> "１０"
なんかメソッドないのかな……
追記
diaphragmさんに以下のメソッドを教えて頂きました。
'12345'.tr('0-9', '０-９')
こちらのが楽ですね
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