Are 10s confusing? Your first graders will make sense of tens for place value as they sort and match cards, some with ten-frame models. For example, 20 can be 2 tens or 20 ones. And you'll be in complete control of each PowerPoint file and can upload directly to your Google Drive as Slides, if desired.
The following PREVIEW shows all 20 slides. Also see printable card games for this topic.
Preview of All 20 Slides