Hidden words for word work time. Kids write the word in white crayon, and then color over it with marker to make it appear. Could do with numbers- instead of markers using watercolors- students paint over to make number 'appear.
Other ways to say & - a Prof. I had last semester actually did this when she taught high school and the results amazed her! As the school year progresses, you can also use this technique with other words that students tend to abuse in your classroom.