This page is full of quality links to some of the best pre-assessment and prior knowledge advice and options on the Web. It's a great one-stop shop to help you brainstorm what will work best for your math students.
For pre-assessments to be effective, you have to have a plan in place for why and how you are pre-assessing your students. This visually-impressive pdf breaks down the entire process behind planning a pre-assessment and the pros and cons of some of the most popular types of pre-assessments.
The master guide of pre-assessments. This free book gives a brief introduction to 50 different pre-assessment strategies teachers can use along with a link to a teacher or education website with a strong example of how the assessment looks in practice.
This article is perfect when you want to switch things up and find out what students know without relying on the same, boring pre-test. All 10 ideas can work for any subject matter but fit very well for math concepts.