Algebra tiles are arguably the most common and useful manipulative in the algebra classroom. They are also one of the most misunderstood. Advocates are wholehearted and love to show off the exciting...

The Common Core Math Standards adopted by many US states are an attempt to establish consistent, age-appropriate, research-backed goals for math learning. This allows more easeful transitions for...

The Common Core State Standards (CCSS) include eight “Mathematical Practices” that teachers and students are encouraged to use throughout their mathematical lives. These are different from the...

The Common Core State Standards (CCSS) include eight “Mathematical Practices” that teachers and students are encouraged to use throughout their mathematical lives. These are different from the...

The next-to-last step of any problem solving should be checking your answer for reasonableness. (The last step, of course, is stating the answer clearly and completely.) Often when we're working...

You may have a vague memory and understanding that numbers come in two forms: prime numbers and composite numbers. (Or at least prime and not prime.) Both of these terms have to do with a number's...