Number Line, by MLC vs Terrific Triangle
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Number Line, by MLC
This app allows students to visualize number sequences and demonstrate mathematical strategies. It supports various number types and offers tools for annotation, problem-solving, and sharing work. Ideal for elementary classrooms and iPad learning environments.
- Visualize number sequences
- Demonstrate counting, adding, subtracting, multiplying, dividing
- Use whole numbers, fractions, decimals, or negative numbers
- Add custom tick marks and labels
- Hide and reveal numbers and jumps
- Annotation and drawing tools
- Save and share work
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Number Line helps students visualize number sequences and demonstrate strategies for counting, comparing, adding, subtracting, multiplying, and dividing. Choose number lines labelled with whole numbers, fractions, decimals, or negative numbers. Or use a blank number line, with or without tick marks. Describe intervals between points on the line using forward or backward jumps above and below the line. Jumps can be labelled with their values or left blank. Add custom tick marks to the number line to show equivalence or compare number values. Show strategies with drawing and annotation tools. Hide elements of the sequence shown on the number line, which challenges students to use what they know about number relationships and computation to identify those missing elements. This virtual number line is an open-ended educational tool, ideal for elementary classrooms and other learning environments that use iPads. For more Number Line resources and other apps, visit: www.mathlearningcenter.org/apps FEATURES • Mark the number line with multiples of whole numbers, fractions, or decimals. In addition, set the starting value of the line, including using negative values. • Add and manipulate forward and backward jumps, above or below the line. • Label jump bars, manually or automatically, to show intervals or hide labels altogether. • Add custom tick marks and values to blank number lines. • Hide and reveal numbers on the number line. • Hide and reveal jumps, numbers, and other elements with resizable covers to create your own problems and model strategies. • Use the drawing tools to annotate work and show understanding. • Add equations, expressions, and descriptions with the math text and writing tools. • Share your work by saving an image or providing a share code to others. MORE APPS For more Number Line resources and other apps, visit: www.mathlearningcenter.org/apps LEARN MORE To learn about Bridges in Mathematics, an elementary curriculum that employs visual models like number line, visit: www.mathlearningcenter.org/bridges/overview ABOUT US This resource is brought to you by The Math Learning Center, a nonprofit organization dedicated to K-12 education since 1976. ACKNOWLEDGEMENTS This app was crafted by Clarity Innovations. We help improve teaching and learning by creating solutions that match promising technologies with the needs of education. Visit us: www.clarity-innovations.com
Terrific Triangle
Practice math fact families for addition, subtraction, multiplication, and division. This educational tool offers individual fact practice with a score and adjustable difficulty, including an optional timer. It's a free, ad-free way to master number relationships.
- Fact family practice
- Addition/subtraction drills
- Multiplication/division drills
- Adjustable difficulty
- Optional timer
- Running score
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A math facts drill-and-practice program that teaches fact families for both addition/subtraction and multiplication/division. Terrific Triangle allows individual facts practice with a running score for correct answers. The player may select a difficulty level and whether to play against a timer. The triangle presents two parts of a fact family and the player must determine the missing third part. The sum and product always appear at the top of the triangle. The addends and factors always go in the two lower corners. This app contains no ads or links to social media. Just FREE.
Screenshots
Verdict
The clearest difference is rating: Number Line, by MLC at 4.4 against Terrific Triangle's 4.0. Number Line, by MLC also leads on ratings volume (15 vs 5). Terrific Triangle's advantage is device support (3 vs 1) and iOS requirement (12.0.0 vs 16.1). On price, review sentiment, update cadence 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. Neither carries in-app purchases, so what you see is what you pay.
Number Line, by MLC holds the better App Store score, 4.4 against 4.0. Both are backed by a comparable volume of ratings — 15 and 5 respectively. Written reviews split almost evenly too, at 67% and 67% positive.
Number Line, by MLC ships an update every 13 months, Terrific Triangle every 10 months. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | Number Line, by MLC | Terrific Triangle |
|---|---|---|
| Price | Free | Free |
| Rating | 4.4 (15 ratings) — better | 4.0 (5 ratings) |
| Positive reviews | 66.7% of reviews | 66.7% of reviews |
| Number of ratings | 15 — better | 5 |
| Update frequency | Every 13 months | Every 10 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.1 | 12.0.0 — better |
| Further details — not scored | ||
| Size | 7 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | The Math Learning Center | Elementary Software |
Customer experience
Number Line, by MLC
Terrific Triangle
In-app purchases
Number Line, by MLC
No in-app purchases
Terrific Triangle
No in-app purchases
Questions
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Is Terrific Triangle free?
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