This 7 minute video (with commentary) discusses the concept of exchange and shows various activities involving concrete step-counting and numbers built out of base-10 materials on place value mats.
A game played with Cuisenaire rods on a 100-square that focuses on the principle of exchange underpinning the concept of place value. (A 2 minute silent stop-motion movie.)
A card game about place value in 2-digit numbers and rounding numbers to the nearest 10. (A 2 minute silent stop-motion movie.)