Quick! What’s the commutative law of addition?
Can’t remember? It just means you can add numbers in any order and get the same result.
2 + 3 = 5
3 + 2 = 5
You may have learned this concept in school. You probably remember the rule, but the name may have slipped your mind.
Why does this matter? Maybe you’d like to help your child with homework, or perhaps you’re going back to school and need to take a math placement exam.
A great place to brush up on old math skills (or to learn new ones) is The Saylor.org Foundations of Real World Math course.
The course is made of seven units. It covers basic math concepts, like the commutative law of addition, and advances through negative numbers, percentages, ratios and graphs and charts. The goal of the course is “not just to help you learn basic algebra and geometry topics, but also to show you how these topics are used in everyday life.”