"Banco de Cerditos" is a vocabulary game that was passed on to me. I've pre-filled the pigs with a variety of numbers 1-1 billion for you.
Here's how it works:
Students get into groups of 2 or 3 with their desks facing towards each other. Each student needs a different colored crayon/marker/colored pencil. On the sheet there are numbers and words. *The key is to call the OPPOSITE of what's on their paper.
For instance, I say "quinientos" and they look for the number 500. OR, I say 3 billion and they look for the word "tres billónes"
Whoever finds the correct number/word first gets to color their pig. Most pigs at the end wins. They LOVE this and get super into it. It usually takes up about 30 minutes of class too! Great review game for any vocabulary in any language.