IXL Learning Curriculum Designer (Math) interview questions

I had a phone interview with a curriculum designer, completed a written task, had a second phone interview, and then finally had an on-site interview for which the company flew me to the bay area. As a former high school math teacher, I really liked the questions I was asked in the interview. The interviewers wanted to test my mathematical competency, my knowledge of math eduction, and generally, how I think and communicate. They asked me how I would teach some topics in high school and in elementary school mathematics and asked me how I would design an IXL "skill" on each topic. They also asked some brainteasers/logic puzzles. I'm a big nerd, so I though these were a lot of fun.

I first interviewed over the phone with a current Math Curriculum Designer. Standard interview questions with a brain teaser about 3 different boxes at the end. I had a lot of experience designing educational materials so I had a lot to talk about and thought it went well. They gave me an online assessment to see what kind of product I would design, and I wasn't given an offer after that.