IXL Skill Review and Practice - K-12 learning experience that provides comprehensive, standards-aligned content
https://www.ixl.com/home
Transum - Free mathematical activities, puzzles, problems, visual aids, investigations and challenge
www.transum.org/Software/
Prodigy - Online math game
https://play.prodigygame.com/
Math Guide - Free lessons and interactive quizzes
Pre-Algebra
Geometry
Algebra
Probability Basics
Math Mammoth - Free pre-algebra videos for middle school
https://www.mathmammoth.com/videos/prealgebra/pre-algebra-videos.php
Math is Fun - Math explained in easy language, plus puzzles, games, quizzes, and worksheets.
https://www.mathsisfun.com/
Greg Tang Math - Strategy games - Games, puzzles and summer math challenge
http://gregtangmath.com/
Cool Math 4 Kids - Games and Lessons
https://www.coolmath4kids.com/
Solve Me Puzzles - Puzzles that transition to algebra
http://solveme.edc.org/
Ken Ken - Strategy Games - Puzzles and games
http://www.kenken.com
NCTM- Strategy games - Created by the National Council of Teachers of Mathematics
https://calculationnation.nctm.org/
Sheppard Software - Strategy Games - Strategy games
http://www.sheppardsoftware.com/braingames/braingames.htm
Purple Math - practical lessons on pre-algebra and algebra
http://www.purplemath.com/modules/index.htm
YouCubed - Math Mindset resources
https://www.youcubed.org/
Math Doku - Free online puzzles
http://www.mathdoku.com/
Math Forum - Resources for math topics
http://mathforum.org/library/
Arcademic Skill Builders - Fun and free educational games for kids
https://www.arcademics.com/
Khan Academy - introduction videos, videos that solve real-world problems related to the topic, and practice problems
https://www.khanacademy.org/
Count On - Games and resources. Includes online Sudoku puzzles
http://counton.org/
Absurd Math - Pre-Algebra - interactive mathematical problem solving game series.
http://www.learningwave.com/abmath/
Fun Brain - Math games and videos
https://www.funbrain.com/
Soft Schools.com - Math games and online practice
http://softschools.com/math/games/
Math Playground - Games and Puzzles
https://www.mathplayground.com/
Figure this - math games and challenges for families
http://figurethis.nctm.org/download.htm
Geogebra- interactive geometry website.
https://www.geogebra.org
Math.com - resources for students, and parents
http://www.math.com/students/practice.html
Freckle Math - Students work on math problems at their level
https://www.freckle.com/
Cool Math - Free online math lessons, math games, and fun math activities
http://www.coolmath.com/
Quizziz - Free gamified quizzes for every subject
https://quizizz.com/
Common Core Standards - These standards define what your students will learn this year.
http://www.corestandards.org/Math/Content/7/introduction/