MLC Number Rack
Product by The Math Learning Center
The Bottom Line
Partially. MLC Number Rack does not teach concepts independently, as it lacks built-in instruction, feedback, or structured practice. However, it functions as a highly effective digital manipulative that supports cognitive offloading and subitizing when paired with guided adult instruction. It is a tool for visualizing math, not an independent tutor.
Pros
- Facilitates subitizing by grouping beads into distinct color sets of five.
- Reduces working memory load by allowing students to physically manipulate variables during complex addition and subtraction problems.
- Provides a clean, distraction-free interface that prevents cognitive overload.
Cons
- Lacks built-in instruction or worked examples to guide independent student learning.
- Provides no corrective feedback to alert your child when they make a mathematical error.
- Does not include structured practice sets or spaced repetition to reinforce math facts.
What Do We Know About MLC Number Rack?
MLC Number Rack is not an independent learning app, but it is an effective supplementary tool when used alongside parent or teacher instruction. It operates purely as a digital manipulative, meaning it provides a virtual version of the physical rekenreks used in elementary classrooms. Your child cannot open this app and learn math on their own. There are no lessons, no practice quizzes, and no algorithms guiding them through a curriculum. Instead, it relies entirely on adult facilitation to create learning moments. The app excels at helping early math learners build number sense through visualization. By moving beads across the screen, your child can visually grasp the concepts of grouping, addition, and subtraction. The color-coded beads encourage subitizing, which is the ability to instantly recognize the number of objects in a small group without counting them one by one. This reduces the cognitive load on your child's working memory as they tackle larger math problems. Because The Learning Standard has not yet officially evaluated this app, we cannot provide a definitive efficacy rating. However, as an open-ended digital whiteboard for math visualization, it effectively mirrors proven classroom interventions.
How Does MLC Number Rack Work?
MLC Number Rack relies on an open-ended, exploratory pedagogical approach rather than structured, mastery-based progression. The app functions as a blank digital canvas where users can generate up to ten rows of ten beads. Each row contains five red beads and five white beads, deliberately designed to anchor a child's understanding of numbers to groups of five and ten. Your child interacts with the app by sliding these beads back and forth along the virtual wires to represent different mathematical equations. A built-in text tool allows users to write numbers or equations next to the visual representation. Because there is no underlying logic engine evaluating the math, the app never interrupts to correct mistakes or prompt the next step. The learning mechanics are entirely dependent on physical interaction and visual feedback. By physically moving the beads, your child engages in embodied cognition, which helps cement abstract numerical concepts into concrete visual memories.
Strengths and tradeoffs of MLC Number Rack
The biggest strength of MLC Number Rack is its simple, distraction-free translation of a physical manipulative into a digital format, while its biggest weakness is the complete absence of independent instructional scaffolding. Cognitive Support: The app excels at supporting working memory. When your child struggles to hold multiple numbers in their head during mental math, the virtual beads serve as an external storage system. This allows them to focus their mental energy on problem-solving rather than simply remembering the numbers. Visual Grouping: The five-and-five color structure heavily relies on the cognitive principle of subitizing. It forces learners to stop counting by ones and start recognizing numbers as components of larger sets. Lack of Feedback Loop: The most significant flaw is the lack of a feedback mechanism. Effective learning requires immediate, corrective feedback when a mistake is made. If your child groups the wrong number of beads, the app will not correct them, meaning they can inadvertently practice and reinforce incorrect math facts. No Retrieval Practice: The app does not prompt learners to recall information from memory. It requires an educator or parent to supply the problems, making it a passive tool rather than an active learning environment.
Who Might Benefit From MLC Number Rack?
MLC Number Rack is best for early elementary students who need visual and tactile support to understand basic addition, subtraction, and grouping concepts. It is specifically designed for children in kindergarten through second grade who are currently learning to build number sense. This app is an excellent resource for parents helping their children with math homework or educators delivering direct classroom instruction. It is not suitable for older children mastering complex algorithms, nor is it appropriate for children who need an app they can use independently while unsupervised.
Data Transparency
Does Not Meet Data Transparency Standard
MLC Number Rack does not meet our data transparency standard. Its privacy policy does not document basic protections, including limits on sharing children's data, a COPPA or FERPA commitment and parents' right to see their child's data.
13 of 35 checks passed
Evaluated September 2026
Apps Privacy Statement →Level 1 · Basic protections
Does not sell data or target ads at students, limits sharing, and lets parents see and delete their child's data.
Not documented: limits on sharing children's data, a COPPA or FERPA commitment, parents' right to see their child's data, parents' right to delete their child's data
Level 2 · Parent control (meets the standard)
Families can get their data out, know who processes it, and know how long it is kept.
Not documented: self-service deletion
Level 3 · Direct data access
Families or schools can pull their own data through an API, in a stated format.
Not documented: an API for retrieving their own data, a named export format
View all 35 checks
Parent Access0/8
Does the policy mention parents specifically?
The policy does not mention parents.
Can parents view their child's data?
The policy does not address parents viewing their child's data.
Can parents modify their child's data?
The policy does not address parents modifying their child's data.
Can parents delete their child's account?
The policy does not address parents deleting their child's data or account.
Is there a dedicated Children's Privacy section?
The policy has no dedicated children's privacy or COPPA section.
Does it reference COPPA compliance?
The policy does not reference COPPA.
Does it reference FERPA compliance?
The policy does not reference FERPA.
Is parental consent required for child accounts?
The policy does not address parental consent for child accounts.
Data Portability2/5
Can users access their personal data?
“If you wish to access, correct, update, or request deletion of your personal information, you can do so at any time as described in the “Updating & Correcting Personal Information” heading below.”
Can users download/export their data?
“In addition, you can object to processing of your personal information, ask us to restrict processing of your personal information, or request portability of your personal information.”
Is there a self-service data access tool?
The policy describes access requests by email only, not a self-service access tool.
Is a specific data format mentioned for export?
The policy does not name an export format.
Is there an API for data access?
The policy does not describe an API for users to retrieve their data.
Data Minimization3/6
Is data collection itemized?
“the information collected on the Website may consist of information including, but not limited to, your full name; home or business address; billing address; phone number; fax number; email address;”
Can the app be used without a real name?
“We will never ask you to provide us with your or someone else’s personal information in order to access, or while you are using, the Apps.”
Can the app be used without an email?
“We will never ask you to provide us with your or someone else’s personal information in order to access, or while you are using, the Apps.”
Does it state collection is limited to what is necessary?
The policy does not state a general rule limiting collection to what is necessary.
Is IP address anonymized or truncated?
The policy says IP addresses are collected but does not say they are anonymized or truncated.
Is location tracking explicitly excluded?
The policy says aggregated regional location data is collected and does not rule out location tracking.
Third-Party Protection5/7
Does it explicitly state no selling of data?
“Except in the limited circumstances stated in this Privacy Statement, we do not share, sell, or otherwise transfer or disclose your personal information to any third party.”
Are third-party providers named?
“Google Analytics™: We use Google Analytics™ on our Website to gather usage data from our Website, including our Web Apps.”
Are providers contractually restricted?
“These third parties are required to keep the information confidential and are not authorized to process your personal information or Automatically Collected Information for any other purpose other than as instructed by us.”
No-targeted-advertising commitment?
“We do not use any advertising, targeting, or marketing cookies on our Website or Apps.”
Is AI/ML data sharing addressed?
The policy does not address AI or machine learning.
Child-specific sharing restriction?
The policy has no sharing restrictions specific to children.
Cookies/tracking limited or opt-out?
“Most browsers allow you to refuse to accept cookies and to delete cookies, though the methods for doing so may vary from browser to browser.”
Deletion & Retention3/5
Can users delete their account?
“If you request that your personal information be changed or deleted from our databases, we will use commercially reasonable efforts to remove your personal information from our databases”
Self-service deletion mechanism?
The policy describes deletion by email request only, with no self-service deletion.
Specific data retention timeline?
“Currently, Save States are set to automatically delete after two years from their last date of access.”
Auto-deletion of inactive accounts?
The policy covers automatic deletion of unaccessed Save States, which are not linked to accounts, but not deletion of inactive accounts.
Post-deletion handling described?
“When we have no ongoing legitimate business need to process your personal information, we will either delete it or anonymize it, or, if this is not possible (for example, because your personal information has been stored in backup archives), then we will securely store your personal information and isolate it from any further processing until deletion is possible.”
Advertising0/4
Advertising model explicitly disclosed?
The policy says no advertising cookies are used but does not explicitly state that the product has no advertising or describe an advertising model.
Free from third-party advertisements?
The policy says no advertising cookies are used but does not explicitly state that the product shows no third-party ads.
Children excluded from ad targeting?
The policy does not address ad targeting of children specifically.
Ad-free option available?
The policy does not explicitly state that the product is ad-free or offer an ad-free option.
What This Means
The policy review did not meet our data transparency standard. The checks above show the documented findings and unknowns. A missing statement does not establish how the app handles data in practice.
About this evaluation: Based on automated analysis of Apps Privacy Statement using the Common Sense Privacy Program framework. Quoted text is copied from the policy; unquoted notes are our summary. Results describe the policy disclosures we assessed; unknown checks are excluded from scores. Privacy policies can change. This review reflects the version we analyzed and does not determine legal compliance.
Sources and review method
TLS combines product information and editorial analysis to explain how MLC Number Rack works, its tradeoffs, and the questions to ask before choosing it. Product features, an instructional rationale and evidence of learning outcomes are different kinds of information.
Formal Learning Standard assessment: not yet completed. Data Transparency findings are reported separately and do not establish learning effectiveness. Read our methodology.
Frequently Asked Questions About MLC Number Rack
Is MLC Number Rack free?
Yes, MLC Number Rack is completely free to download and use. It contains no in-app purchases, no subscription paywalls, and no third-party advertisements, ensuring an uninterrupted educational experience.
Is MLC Number Rack good for kindergartners?
Yes, MLC Number Rack is highly effective for kindergartners when used with an adult. It helps young learners transition from counting on their fingers to visualizing groups of fives and tens, which is a foundational skill for early mathematics.
What does MLC Number Rack teach?
MLC Number Rack teaches early number sense, focusing on addition, subtraction, and the composition of numbers up to 100. It emphasizes grouping by fives and tens to help children move away from counting by ones.
Does MLC Number Rack provide independent math practice?
No, MLC Number Rack cannot be used for independent practice. It is an open-ended digital manipulative, meaning it provides no math problems, no instructions, and no corrective feedback. A parent or teacher must provide the math problems.
How does MLC Number Rack compare to physical rekenreks?
MLC Number Rack functions identically to a physical rekenrek but offers digital conveniences. While it lacks the true tactile sensation of physical beads, it allows users to easily add up to ten rows, write digital equations on the screen, and reset the board instantly.
Has The Learning Standard evaluated MLC Number Rack?
TLS has not yet completed a Learning Standard evaluation of how well MLC Number Rack teaches. Its privacy policy has been reviewed for Data Transparency and does not yet document the basic protections (Level 1).
Is MLC Number Rack COPPA compliant?
A COPPA reference was not found in the reviewed privacy policy. This does not determine whether the app complies with COPPA. Policy review note: The policy does not reference COPPA.
Is MLC Number Rack FERPA compliant?
A FERPA reference was not found in the reviewed privacy policy. This does not determine whether the app complies with FERPA. Policy review note: The policy does not reference FERPA.
Does MLC Number Rack have a children's privacy policy?
No dedicated children's privacy section was found in the reviewed policy. Policy review note: The policy has no dedicated children's privacy or COPPA section.
Does MLC Number Rack sell student data?
The reviewed policy states that the app does not sell data. This is a policy statement; actual data practices were not verified. Policy review note: The policy states the vendor does not sell personal information.
Can you delete your data from MLC Number Rack?
The reviewed privacy policy describes account deletion. We have not tested the deletion process. Policy review note: Users can request deletion of their personal information.
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