You can use this as a guided practice activity, review, or quiz.
Students will model, write equations, and add using expanded form.
I designed this to go along with the rigor of common core and state standards. Students are not just adding, they are showing that they understand the concept of addition and can explain and show what they are doing.
You can pull this up on the smart board and use the sheet as a follow along activity. You can also use it to show proof of understanding in each area. :)