Khan Academy

Khan Academy

When you open the web page to Kahn Academy, there's a drop down menu at the top of the page where you pick the subject to work on.  When you hover over "math", you are then able to choose your grade level (K-12).  When you choose a grade, there are several categories that come up for the grade level; for high school, you choose the concept that you want to address.  When you choose your desired skill, the activities are listed in order of difficulty/learning order.  For example, third grade area activities starts with "Introduction to Area" before moving on to measuring the same shape with different units and finding area by multiplying.  Once you click on the skill you'd like to address, students will be asked to do practice questions.  Students must get five questions in a row correct before they can move on to practice a new skill.  In the classroom, these would be great for whole group lessons and for whole class review before a test.  They could even be used as a center if the teacher pre-determined which skills to work on.

Standards:
These questions are meant for students in grades K-12 and cover the following mathematical domains: counting and cardinality, operations and algebraic thinking, number and operations in base ten, number and operations -- fractions, the number system, ratios and proportional relationships, expressions and equations, functions, measurement and data, geometry, statistics and probability.