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The words ごろ and ぐらい both mean approximately. The word ごろ is used when speaking about points in time.

English	Japanese
At about what time is dinner?	晩ばんご飯はんは何なん時じごろですか。 bangohan ha nanzi goro desu ka.
(She) came home at about four a.m.	午ご前ぜん四よ時じごろにうちへ来きました。 gozen yozi goro ni uti he kimasita.

When speaking about anything else than a point in time, for example a duration, we use the word ぐらい to mean approximately.

English	Japanese
It took about a week.	一いっ週しゅう間かんぐらいかかりました。 issyuukan gurai kakarimasita.
It was about sixty dollars.	六ろく十じゅうドルぐらいでした。 rokuzyuu doru gurai desita.
(I) asked him about ten times.	彼かれに十じゅっ回かいぐらい聞ききました。 kare ni zyukkai gurai kikimasita.

Question	Answer
dinner	晩ばんご飯はん bangohan
about; approximate time	ごろ goro
At about what time is dinner?	晩ばんご飯はんは何なん時じごろですか。 bangohan ha nanzi goro desu ka.
(She) came home at about four a.m.	午ご前ぜん四よ時じごろにうちへ来きました。 gozen yozi goro ni uti he kimasita.
about; approximately	ぐらい gurai
It took about a week.	一いっ週しゅう間かんぐらいかかりました。 issyuukan gurai kakarimasita.
dollar	ドル doru
It was about sixty dollars.	六ろく十じゅうドルぐらいでした。 rokuzyuu doru gurai desita.
to ask	聞きく kiku
(I) asked him about ten times.	彼かれに十じゅっ回かいぐらい聞ききました。 kare ni zyukkai gurai kikimasita.

Practice this lesson

Learn Japanese Lesson 137: Using ごろ and ぐらい for approximation