FREE!!! Spanish Number Chart - Los números en español
I print out this chart for my students on neon paper. They keep it with their Spanish materials and to reference.
The chart lists the Spanish numbers by place value and covers the ones, tens, hundreds, and thousands. It also has a small box at the bottom for students to learn the words for millions, billions, and trillions.
You could also print it out and enlarge it to make useful poster for in your classroom.
Hope you find it helpful!