# Calculation Triangle vs Number Pieces, by MLC

The clearest difference is review sentiment: Number Pieces, by MLC at 88% against Calculation Triangle's 30%. Number Pieces, by MLC also leads on price (Free vs $0.99) and rating (4.0 vs 3.0). Calculation Triangle's advantage is device support (3 vs 1) and iOS requirement (6.0 vs 14.7). On ads and in-app purchases there is nothing between them.

Number Pieces, by MLC is free to download; Calculation Triangle costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Number Pieces, by MLC holds the better App Store score, 4.0 against 3.0. That said, the two scores are not equally well evidenced: Number Pieces, by MLC has 19 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 30% of Calculation Triangle's written reviews are positive against 88% of Number Pieces, by MLC's.

Calculation Triangle ships an update every 21 months, Number Pieces, by MLC every 9 months. The most recent releases landed on September 21, 2026 and July 9, 2026 respectively.

## The numbers

| Metric | Calculation Triangle | Number Pieces, by MLC |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/calculation-triangle/id575736731/reviews) | **[4.0 (19 ratings)](https://appshunter.io/ios/app/number-pieces-by-mlc/id605433778/reviews)** |
| Number of ratings | 1 | **19** |
| Positive reviews | 30.0% of reviews | **87.5% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 9 months** |
| Monetization | Paid | **Free** |
| Size | 22 MB | 8 MB |
| Requires iOS | **6.0** | 14.7 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Christian Urff](https://appshunter.io/developer/415894463) | [The Math Learning Center](https://appshunter.io/developer/1542700905) |

## What reviewers say

### Calculation Triangle

[App page](https://appshunter.io/ios/app/calculation-triangle/id575736731)

This virtual manipulative helps develop flexible arithmetic thinking. Users can create puzzles, model problems, and explore number relationships by adding, moving, and hiding tokens within a calculation triangle.

**Highlights:** Virtual calculation triangle manipulative, Token manipulation for arithmetic, Create and solve number puzzles, Hide/show fields and numbers, Shake to clear the triangle, Explore number relationships

**Features:** macOS Compatibility

**In-app purchases:** none


### Number Pieces, by MLC

[App page](https://appshunter.io/ios/app/number-pieces-by-mlc/id605433778)

This app helps students grasp place value and computation with multi-digit numbers using interactive visual tools. Users can manipulate number pieces to add, subtract, multiply, and divide, fostering a deeper mathematical understanding.

**Highlights:** Manipulate ones, tens, and hundreds pieces, Regroup pieces (e.g., 10 ones to 1 ten), Measure array dimensions with an edge piece, Use drawing and text tools for annotations, Zoom, scroll, and hide/reveal work, Share work via image save or share code

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Calculation Triangle free?

Calculation Triangle costs $0.99, with no in-app purchases.

### Is Number Pieces, by MLC free?

Number Pieces, by MLC is free to download, with no in-app purchases.

### Which has better reviews, Calculation Triangle or Number Pieces, by MLC?

Number Pieces, by MLC is rated higher. Calculation Triangle averages 3.0 out of 5 from 1 ratings, while Number Pieces, by MLC averages 4.0 from 19 ratings.

### Do Calculation Triangle or Number Pieces, by MLC have ads?

Neither Calculation Triangle nor Number Pieces, by MLC shows ads.

### Which is updated more often, Calculation Triangle or Number Pieces, by MLC?

Calculation Triangle ships an update every 21 months, and Number Pieces, by MLC every 9 months. Most recently, Calculation Triangle was updated on September 21, 2026 and Number Pieces, by MLC on July 9, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*