This math video tutorial provides a basic introduction into subtraction with regrouping. It contains plenty of examples and practice problems.

Basic Addition: https://www.youtube.com/watch?v=2WxfQIElJuw

Basic Subtraction:
https://www.youtube.com/watch?v=3fYgZgbOJmM

Addition and Subtraction - Number Lines:
https://www.youtube.com/watch?v=wNhbz1EUPrc

Long Multiplication:
https://www.youtube.com/watch?v=GKetIwxaenA

Lattice Multiplication:
https://www.youtube.com/watch?v=ZDmNdjiYAIw

Area Model Multiplication:
https://www.youtube.com/watch?v=UV0ky5fESI0

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Basic Division:
https://www.youtube.com/watch?v=yAJxHO7CLh4

Long Division:
https://www.youtube.com/watch?v=GiiuZ8sfw00

Short Division:
https://www.youtube.com/watch?v=uKsSB8zIR9M

Mental Math Tricks:
https://www.youtube.com/watch?v=nTn9gVqRfKY

Exponentiation and Tetration:
https://www.youtube.com/watch?v=S3s9cWWnZj0

Final Exams and Video Playlists:
https://www.video-tutor.net/