# Pearl Diver: Number Line Math

> Educational game for mastering number lines, fractions, and decimals. (iPhone/iPad app by New Mexico State University Board of Regents.)

- Source: https://appshunter.io/ios/app/pearl-diver-number-line-math/id337567843 (this page in markdown: same URL + `.md`)
- Developer: [New Mexico State University Board of Regents](https://appshunter.io/developer/337567846)
- Category: Education, Games
- Price: Free
- Rating: 5.00/5 from 2 App Store ratings · 21 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 28 MB
- Languages: American English, European Spanish
- Released: 2009-11-05
- Data updated: 2026-06-05
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/pearl-diver-number-line-math/id337567843/reviews.md

## What is Pearl Diver?

Throw on your diving helmet, and head into the depths of the sea!  Master the number line, including fractions and decimals, while gathering beautiful pearls. Will you find the elusive black pearl?

• Ideal for elementary and middle school students, grades 3-8.

Developed by mathematics educators, researchers, and game developers at the Learning Games Lab at New Mexico State University.  Games developed by the Learning Games Lab undergo a rigorous instructional design process, extensive user testing, and input from learners, teachers, and researchers.  

Pearl Diver addresses Common Core standards relevant to the number line and properties of numbers, including:
  •  Understanding numbers, ways of representing numbers, and number systems.
 • Understanding and representing commonly used fractions.
 •  Understanding fractions as part of unit wholes and as locations on number lines.
 •  Comparing and ordering fractions, and finding their approximate locations on the number line.

Read about research documenting learning effectiveness of Math Snacks: http://mathsnacks.com/research.html

Pearl Diver was developed as part of the "Math Snacks" initiative.  Other free animations, activities, and games are available through the Math Snacks web site at http://mathsnacks.org.

Math Snack materials were developed with support from the National Science Foundation (0918794 & 1503507). Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Some materials were originally prototyped or discussed as part of a cooperative agreement from the U.S. Department of Education (U295A050004).

## Key features

- Number line mastery
- Fractions and decimals
- Common Core alignment
- Progress tracking
- Educational game design

## Recent user reviews (10 of 21)

All indexed reviews: https://appshunter.io/ios/app/pearl-diver-number-line-math/id337567843/reviews.md

### 1/5 — Black screen on iphone5

*2015-11-06*

With music and some obscure graphics on the side - please fix!!!

### 5/5 — Learning the Number Line

*2014-07-03*

My 6-year-old enjoys the first few levels of this game and has played it many times. The later levels with fractions and negative numbers are pretty fun too. Definitely can see how it would help kids practice the number line.

### 5/5 — Great

*2014-05-19*

This is a great game why is there no comments.

### 5/5 — Pearl diver

*2012-10-05, version 2.1*

This app is brilliant for learning decimals plus and minus numbers. Highly recommend it for children , they enjoy playing it.

### 5/5 — I love math

*2011-12-26, version 2.1*

My school just go iPad 2s and it had this game I really liked it so I got it on my phone

### 2/5 — Great idea - lousy quality

*2011-10-26*

This is a great idea, but execution is badly in need of improvement. The first few seconds on every level are wasted as the screen is blocked by an unnecessary message. That info should be in the tutorial or even learned by error. There are the levels where the target numbers are too small to read (the font is fuzzy in the numerators of fractions.) The knife is about 500 pts. wide with no indication of where it will cut. Once you cut the eel using the ruler, the scoring shows targets that are off when measured by the ruler provided. The worst mistake is on the last couple levels where a target of 11/2 is displayed as 1/2 - there is no way to know whether the first digit was dropped by programming error or if the target really is 1/2. An educational ap should not have such a gross error.

### 5/5 — Horrible game

*2011-06-12*

Every time I dive it said I got a boot I only got the pearl one time you'll need to fix it.

### 5/5 — Pearl diver's awesome!

*2011-05-02*

It teaches me a lot!

### 2/5 — Huh?

*2011-03-23*

Yay! Let's all have fun with fractions! NOT! What is the point of this game, seriously!

### 4/5 — Nice free learning game

*2011-01-29*

It's a fun game for the kids to learn fractions on. Would have been nice to have a few more levels and the ability to control the difficulty, but maybe that will come with the paid version.

## Frequently asked questions about Pearl Diver

### What age group is Pearl Diver best suited for?

Pearl Diver is ideal for elementary and middle school students, specifically those in grades 3 through 8. The app's content and gameplay are designed to support learning objectives for this age range.

### Does Pearl Diver cover Common Core standards?

Yes, Pearl Diver addresses Common Core standards relevant to the number line and properties of numbers. This includes understanding number representation, fractions as parts of wholes, and comparing/ordering fractions.

### Is Pearl Diver available on multiple devices?

Yes, Pearl Diver is supported on both iPhone and iPad devices. This allows students to learn on their preferred Apple mobile device.

### How often is Pearl Diver updated?

The latest version of Pearl Diver is 4.1, and it was last updated on March 3, 2025. This indicates a commitment to maintaining and improving the application.

### What is the learning methodology behind Pearl Diver?

Pearl Diver was developed by mathematics educators, researchers, and game developers at the Learning Games Lab. The games undergo rigorous instructional design, extensive user testing, and input from learners and teachers.

### Can I find other Math Snacks resources?

Yes, Pearl Diver was developed as part of the Math Snacks initiative. Other free animations, activities, and games are available through the Math Snacks website.

### Does Pearl Diver have ads?

No, Pearl Diver is ad-free. Users can focus on learning without any interruptions from advertisements.

### What is the user rating for Pearl Diver?

Pearl Diver has a high rating of 5.0 stars based on 2 user reviews. This suggests a very positive reception from its users.

## Version history (last 5 releases)

### 4.1 — 2025-03-03

We've enhanced the game's fonts for improved readability and a more polished visual experience.

### 4.0 — 2020-07-02

Updated to meet Apple requirements.
This version works on both iPhone and iPad.

### 3.0 — 2016-03-08

Bug fixes.

### 2.5 — 2014-07-31

*  Retina graphics.
*  Widescreen iPhone support.
*  Improved gameplay.
*  Spanish-language localization.

### 2.3 — 2012-12-04

Removed OpenFeint support, since the service is shutting down.

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## More apps by New Mexico State University Board of Regents

- [Math Snacks Video](https://appshunter.io/ios/app/math-snacks-video/id341673343)
- [Pearl Diver HD](https://appshunter.io/ios/app/pearl-diver-hd/id364617763)
- [Lobster Diver](https://appshunter.io/ios/app/lobster-diver/id416577542)
- [Lobster Diver HD](https://appshunter.io/ios/app/lobster-diver-hd/id416610863)
- [Math Snacks HD](https://appshunter.io/ios/app/math-snacks-hd/id440524629)

All apps by New Mexico State University Board of Regents: https://appshunter.io/developer/337567846

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*