The below video is a great resource for addition with regrouping. It explains what to do is the sum is a one digit number or a two digit number.
https://www.youtube.com/watch?v=QAL8XxyGVow&list=PLcHBoN1Wbu2MfPWJiRy0ritMVxVz4te_P
Below is a great website to find practice pages for addition and subtraction.
http://www.math-drills.com/
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