'Make a ten' strategy for addition (1st grade math)

A lesson about the concept in addition that I've termed "going over to the next ten". We have either two single-digit numbers or one two-digit and one single-digit number to add. Essentially, you first make ten, and then check what you have "left over".

This strategy promotes number sense (very important for elementary grades) and conceptual understanding.

We look at visual models first and then deal with this concept in an abstract manner. Lastly the lesson includes a few word problems.