Exploring The Core K vs Number Rack, by MLC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Exploring The Core K
This app visualizes Common Core State Standards for K-8 math, showing skill progression across grade levels. It serves as a reference for parents and educators to understand expected math skill sets.
- Visualizes K-8 math standards
- Shows skill development across grades
- Searchable standards
- Glossary of education terms
- Reference tool for parents and teachers
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Exploring The Core: Elementary Math is the best way to *see* what is in the Common Core State Standards for Mathematics. Our math app presents all CCSS standards in Mathematics for grades K-8, illustrating each grade-level skill and aligning to show skill development across grade levels. With this app, teachers and parents can not only read the Common Core State Standards for each grade-level skill, but can also "swipe" to see how each skill develops in and between grade-levels. Searchable Standards and Glossary features eliminate the need for lugging heavy binders of standards and education-specific references around with you. Created by a teacher for teachers and parents, Exploring The Core: Elementary Math is the perfect tool for anybody wanting to understand the basic skill sets expected in the Common Core State Standards. This app serves as a reference tool for parents and teachers. It is not a curriculum and is not intended to serve as a primary teaching tool for students. Learn more at www.ExploringTheCore.com #exploringthecore
Number Rack, by MLC
This virtual manipulative tool helps children develop number sense through interactive bead groupings. It supports exploration of addition and subtraction strategies with customizable rows and colors. Ideal for elementary classrooms, it includes annotation and sharing features.
- 1-10 rows of 10 beads
- Resizable bead covers for subtraction
- Color-coded bead rows
- Annotation and drawing tools
- Math text and writing tools
- Shareable work via image or code
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Number Rack facilitates the natural development of children’s number sense. The movable, colored beads encourage learners to think in groups of fives and tens, helping them to explore and discover a variety of addition and subtraction strategies. This virtual version of the manipulative is an open-ended educational tool, ideal for elementary classrooms and other learning environments. FEATURES • Display 1 to 10 rows of beads, 10 beads per row. • Hide beads with resizable covers, which allows teachers or learners to model subtraction or difference problems. • Reverse the colors of rows 6 to 10 to distinguish (or not) groupings of 25 beads. • Use the drawing tools to annotate work and show understanding. • Add equations, expressions, and descriptions with the math text and writing tools. • Share work by saving an image or providing a share code to others. Great for creating the initial setup of an activity, then sharing it with students so they can explore it further.
Screenshots
Verdict
The clearest difference is rating: Exploring The Core K at 4.4 against Number Rack, by MLC's 3.2. Exploring The Core K also leads on update cadence (every 5 weeks vs every 25 months) and device support (3 vs 1). Number Rack, by MLC's advantage is review sentiment (100% vs 60%) and in-app purchases (none vs 1). On price, ratings volume and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Exploring The Core K sells 1 one-off in-app purchase. Number Rack, by MLC asks for nothing beyond the download.
Exploring The Core K holds the better App Store score, 4.4 against 3.2. Both are backed by a comparable volume of ratings — 7 and 9 respectively. Written reviews complicate that: 60% of Exploring The Core K's written reviews are positive against 100% of Number Rack, by MLC's, so the app with the better star average is not the one people write more warmly about.
Exploring The Core K ships an update every 5 weeks, Number Rack, by MLC every 25 months. The most recent releases landed on September 26, 2026 and October 14, 2026 respectively.
| Parameter | Exploring The Core K | Number Rack, by MLC |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (7 ratings) — better | 3.2 (9 ratings) |
| Positive reviews | 60.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 7 | 9 — better |
| Update frequency | Every 5 weeks — better | Every 25 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 8.0 — better | 14.7 |
| Further details — not scored | ||
| Size | 35 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Exploring The Core LLC | The Math Learning Center |
Customer experience
Exploring The Core K
Number Rack, by MLC
In-app purchases
Exploring The Core K
- Unlock All Grades and Skills$2.99
Number Rack, by MLC
No in-app purchases
Questions
Is Exploring The Core K free?
Is Number Rack, by MLC free?
Which has better reviews, Exploring The Core K or Number Rack, by MLC?
Do Exploring The Core K or Number Rack, by MLC have ads?
Which is updated more often, Exploring The Core K or Number Rack, by MLC?
Other comparisons
