This an outline/example of a small mini lesson used for adding with regrouping. It uses the Pear Deck add-on on Google Drive.

Pear Deck is an add-on for Google Slides that allows you to create interactive Google Slides for you and your students to use. I use them for a mini lesson whenever I am teaching/review content in math. It allows you to create slides that have different ways of interacting with them. You can monitor what the students are doing from the teach dashboard, lock their screens to keep it from being a distraction, and save the work that the students do on the Pear Deck to use it for reflection or even formative assessments.

In the slide it includes adding with the "home" method. This is just what I have called adding with base 10 blocks for my students.

Disclaimer: I am not affiliated/paid by Pear Deck. I just love the resource.