Become an influencer - earn or donate money
Use word of mouth to advertise your business


Comments
Erin Hager - "Math is my favorite, and anything that will help kids to understand and appreciate math more is excellent ! " (link to entry)  
junkfoodkids.com - "I love all the the advantage I can give my kids. And my kids love math." (link to entry)  
Sarah Richards - "simple math is fun!" (link to entry)