Besides the websites below, teachers might also be interested in the Templates section lower on this page.
20 Ways to Ditch That Textbook in K-2
Alice Keeler Kindergarten Templates
GAFE for Littles-Christine Pinto
26 Awesome Kindergarten Common Core Math Technology Activities
Deconstructing numbers:
Students learn how to copy and paste elements of snowmen from different slides. As an extension, you can show them how to use picture tools to change colors and how to rotate objects using the handle. This is a modified version of the slideshow by Eric Curts of Control Alt Achieve.
1-1 correspondence: Students insert pictures or shapes to show the correct number on each slide.
Extension: instead of a number, each slide has an addition problem to be solved. Students use pictures or shapes to illustrate the number sentence and sum.
Tech Extension: Teach students to change the background of each slide.