I created this flipchart to introduce and demonstrate base 10 blocks to an entire class, rather than using actual blocks in a small group (or attempting to hold up blocks for an entire class to see!)
The flipchart first shows what 10s and 1s blocks look like. The pages progress from showing blocks with their written numerals, to showing blocks and the students say what number they're representing. The last page resembles a place value mat. The left side has multiple 10s blocks that can be dragged around the mat by the students. The right side contains multiple 1s blocks. There is a space at the bottom to show the number you want the students to represent with the blocks. It currently says "14", but that number can be dragged to the trash, leaving you room to write in as many numbers as you like.
My first grade students loved this activity, especially the last page. I called students up to the board and assigned them a number to represent with the blocks. The students used the pen to drag blocks to the mat.
This flipchart is great for whole class instruction, but would also make a great addition to math centers.