Free online practice exercises for math
Did you know that Khan Academy not only has videos, but they have added (in recent years) a TON of free interactive practice exercises?
These exercises are of good quality, and also include word problems, graphing, and other problems with visual models. And they span all areas of elementary, middle, and high school math.
You might bookmark some of these pages, in case some day you'd like to find just a few extra practice exercises for your child or student (on just about any math topic) to do interactively...
1. The search page
The search for a math topic will list a lot of videos and exercises intermixed. It will help if you include the word "practice" in your search.
2. Common Core "map" page, from where you can find all sorts of math exercises listed according to grade levels, then Common Core standards (videos not listed here)