We can add numbers -- even large numbers -- without carrying. Carrying is really just a shorthand notation for thinking of 10 units in one place value as 1 unit in the next place value. Thus, it's...

# Tag: howto

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...

Shortly after we start multiplying, we're taught to factor numbers. So often it feels like a pointless rite of passage that we're forced to endure. We learn it devoid of all the contexts it will be...

Few things will help a student keep up in math better than fluently and confidently knowing their multiplication tables. Teachers all over see this slowing students down in math class and undermining...

The area model is a powerful visual tool for organizing multi-digit multiplication. It is build on the premise that the area of a rectangle is the length of the rectangle times the width. Thus, when...