EMBARC.Online

Alcumus is specifically designed to provide high-performing students with a challenging curriculum appropriate to their abilities. 

Many of the problems are from major national math competitions such as MATHCOUNTS, MOEMS, the American Mathematics Competitions, and the Centre for Education in Mathematics and Computing competitions. 

As the student gets stronger, Alcumus automatically provides more challenging material, and conversely, if the student is having difficulty with a particular topic, Alcumus provides additional practice.

https://www.artofproblemsolving.com/alcumus

http://mathcoachscorner.blogspot.com/2012/08/array-models-for-multiplication.html

This is a great blog entry showing how to explain (and use) the array model of the multiplication facts. 

https://www.carrollk12.org/curriculum/elementary/mathematics/Pages/default.aspx

Find your grade level on the left. Then click on the topic you want to teach. Browse through the numerous cool resources they have found for you!

You don't need to buy DreamBox to use their virtual manipulatives. These virtual manipulatives can be used in large- or small-group instructional settings with your interactive white board or projector, or on computers.

http://www.dreambox.com/teachertools?q=/teachertools-quick-images

A community of educators committed to improving math instruction and assessment to help students meet the Common Core Challenge through the use of EngageNY/Eureka Math.

http://engagewa.wikispaces.com/EngageNY+Washington+State+Math+Users+Group

Are you a 3rd or 4th grade teacher needing to enrich your curriculum? Need a little something extra to bring a particular standard to life? Try something from this list...

https://mrjonesmath.wordpress.com/2014/03/29/mr-jones-3rd-and-4th-math-filing-cabinet/

Students practice their fact fluency for addition, subtraction, multiplication, and division using this online webtool.

http://www.factmonster.com/math/flashcards.html

A thought provoking idea: Using games to build conceptual understanding and mathematical fluency.

https://embarc.online/mod/page/view.php?id=9321

https://www.freckle.com/math/

Common Core-aligned online math practice for K-8. This is not aligned specifically to Eureka Math, but it is aligned to CCSS.

http://www.fun4thebrain.com/

Lost of simple online math games for TK - 5.

Resources arranged under the Standards for Mathematical Content. Great math problems to use with your students.

https://www.illustrativemathematics.org/content-standards

These Problems of the Month are organized  by grade level and main topic for that level. These grade‐level expectations are just estimates and should not be used as an absolute minimum expectation or maximum limitation for students. The structure of a Problem of the Month is a low floor and a high ceiling, so that all students can productively engage, struggle, and persevere.

http://www.insidemathematics.org/problems-of-the-month/download-problems-of-the-month

This site provides several engaging sample lessons for each standard at each grade level from K to 5.

http://www.k-5mathteachingresources.com/

Math Collective

The Math Collective is a group of K-8 teachers and math coaches who hope to spread progressive math education to all the students of New York City. They are a collective: their materials and professional development workshops are developed among their members and always shared.

http://www.mathcollective.org/

Math Fact Cafe is a website that generates free math worksheets. This includes math fact worksheets, flashcards, counting, time, and money problems.

https://www.mathfactcafe.com/home/

http://www.mathplayground.com/

This website has it all: number games, flash cards, virtual math manipulatives, The best part of this site are...

• Thinking Blocks: learn how to solve problems using the Singapore bar model. 
• Common Core Math: activities specifically aligned to the CCSS.

https://www.matific.com

Matific takes a unique approach to teaching K to 6 math using hands-on and interactive mini-games, called episodes. These immersive bite-sized apps for tablets and personal computers are based on a modular and progressive spiral learning system.

https://docs.google.com/document/d/1kZyeck-Ophk_Tq1494zRmW7bt7XYe4bRtlPQWTWV3OI/edit?usp=sharing

This is a description of four different ways to multiply two numbers. Each of the four methods can be used for whole numbers, fractions, decimals, and algebraic expressions. These methods are much more powerful than the "traditional" algorithm.

Use this Blendspace as a fun way to 

https://moodle.pleasantonusd.net/mod/page/view.php?id=17672

Challenging math problems worth solving! 

"Open middle” problems have these characteristics:

• they have a “closed beginning” meaning that they all start with the same initial problem.
• they have a “closed end” meaning that they all end with the same answer.
• they have an “open middle” meaning that there are multiple ways to approach and ultimately solve the problem.

http://www.openmiddle.com