関連ワード:  adding 4 digit numbers    adding 4 digit numbers with regrouping    adding 4 digit numbers without regrouping    adding 4 digit numbers using expanded form    adding 4 digit numbers with carrying    adding 4 digit numbers worksheet    adding 4 digit numbers with one exchange    adding 4 digit numbers no exchange    adding 4 digit numbers in columns    adding 4 digit numbers with one exchange worksheet