I've received so many great comments regarding my post from last year, 10 Must-See Website for Reading Intervention, and one of the most common ones has been whether I know of any sites to build math skills and support math intervention.

Math Websites for Intervention Support
As you know, I firmly believe it is important to target specific gaps when planning interventions. So today I am going to share 10 great websites to support your math intervention efforts related to these gaps.
There are a ton of free (or low-cost) resources here including targeted lessons for specific math skills, assessment/progress monitoring tools, and both online and printable intervention supports.
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I've also created a Digital Resource Guide to help you keep the information you'll find below at your fingertips. Just click the button to access it now.
10 Helpful websites for math intervention
1. Xtramath.org

A quick and easy intervention for math fact fluency. The site includes great data and offers support for struggling learners.
Students work to quickly answer basic computation and build fluency and accuracy. If it takes a student too long to answer, the program gives them a visual cue with the answer, but they still have to enter it. Over time the program rotates through the problems the student has yet to master, working them toward fluency.
Over time the program rotates through the problems the student has yet to master, working them toward fluency.
PROS: Great for students with fact fluency gaps
CONS: Only good for interventions for fact fluency – not for kids who aren't accurate & need more hands-on instruction
2. Freckle

This site offers a free teacher account and is great for those students who need a Tier 1 reteach and extra guided practice and support. The program begins with a diagnostic assessment, which helps you identify gaps and targets for support.
With built-in assessment and differentiation, the program monitors how students progress. It also gives modeling and visuals for problem-solving. This is great for those students who are struggling with a specific concept or just-below grade-level standard. Plus it works on tablets!
There are also K-2 friendly lessons and resources on this site, which isn't always the case with math intervention sites.
PROS: Computer adaptive; free for teachers; great reporting features
CONS: Not ideal for Tier 2 or Tier 3 support
3. Mathematical Reasoning Inventory
Need to dig in and identify those gaps? This free tool from math guru Marilyn Burns is just the thing you need. With a free teacher
With a free teacher account, you can have up to 160 kids in the system. The focus of this assessment is an interview-style format that lets you observe to identify misconceptions and thinking strategies.
PROS: Ideal for understanding where students have gaps; perfect for 1:1
CONS: Time-consuming; not ideal for groups

4. Interventions for Math Difficulties
Looking for intervention strategies to use when working one-on-one or in a small group on a specific skill gap? Look no further. These research-based interventions are all clearly outlined to make intervention easier!
PROS: Step-by-step guide to research-based math interventions
CONS: Very plain site that seems questionable at first glance
5. Imagine Math

This site used to be free for students in 3-8th grade in Texas, but it appears this is no longer the case since they transitioned from Think Through Math to Imagine Learning.
The students work on their personalized pathway and can test out of lessons that they have already mastered. There are great, tangible rewards that kids can work together to achieve (like a free pizza party or donating to a special cause) and cool things to purchase to personalize their avatar.
Live teachers are available to support students in walking through challenging problems and help ensure learning is progressing.
While this site isn't perfect for everyone, like TenMarks, it is definitely a great fit for those students who are struggling with on or just-below grade-level standards.
PROS: Part of an integrated personalized learning system available for reading & math; includes access to bilingual teachers online
CONS: Cost
6. Intervention Central
Focused on providing teachers the strategies that are research-based for intervention, Intervention Central is an amazing resource.
Unlike some of the other sites I am listing, this one will take you a bit more time to read and process, but it outlines all the steps for some strong, research-based intervention strategies, along with citations so you can read the original study (if that is your thing).
PROS: Research-based interventions with step-by-step directions & references
CONS: Not the prettiest site; not print & use

7. Tier 1 Strategies for Math
This site by intervention guru Jim Wright is perfect for helping guide systemic math interventions at Tier 1. Each intervention is set up as a quick read and can be implemented at Tier 1 with little extra stress.
PROS: Download & print research-based interventions
CONS: Not the easiest site to navigate; requires prep to use
8. EasyCBM

This site has a great assortment of CBM probes for progress monitoring in both reading and math. Options for math monitoring vary by grade level and focus on core skills like numbers and operations, measurement, geometry, and numbers and operations/algebra, and there are nine probes for each. There are both digital and print versions available for all probes.
The assessments are available for grades K-8.
The lite version is free, and sign up takes less than 5 minutes. Perfect for the busy classroom teacher to collect data for SST.
PROS: Free access to a great variety of progress monitoring resources; digital probes
CONS: Not an intervention; cost for data tracking
9. DreamBox Learning
This adaptive site lets you differentiate to provide personalized instruction in the classroom.
There are lots of great reports, and the site has some great resources for language learners.
The game-based format is engaging for students, which is a major plus for reluctant learners.
You can check out some of DreamBox Learning's sample lessons here.
PROS: Offers great reports & individualized learning
CONS: Requires subscription after trial

10. Math Interventions Tier 1 – 2 – 3
Want a downloadable step-by-step guide to interventions that will help your struggling math students fill the gaps in their mathematical knowledge? This is just the place. Easy-to-use, ready-to-implement strategies that are perfect for documenting in your intervention plan. Just add a data collection plan for progress monitoring, and you've got everything you need to set up your intervention system for success.
Easy-to-use, ready-to-implement strategies that are perfect for documenting in your intervention plan. Just add a data collection plan for progress monitoring, and you've got everything you need to set up your intervention system for success.
PROS: Easy-to-implement strategies with research
CONS: Not a pretty site; not for students
Getting started with digital resources for math RTI
Thanks for checking out these great tools and resources to get you started.
If you want more ideas for free math diagnostic assessments, progress monitoring, or interventions for struggling math students, grab this FREE digital guide.