# Rounding Unlocked — K-5 Rounding & Estimation App

> K-5 Rounding & Estimation App (iPhone/iPad app by One On One Tutoring Service.)

- Source: https://appshunter.io/ios/app/rounding-unlocked/id6780656864 (this page in markdown: same URL + `.md`)
- Developer: [One On One Tutoring Service](https://appshunter.io/developer/1886746583)
- Category: Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.1 · 50 MB
- Languages: American English
- Released: 2026-06-19
- Data updated: 2026-07-18
- User reviews in markdown: https://appshunter.io/ios/app/rounding-unlocked/id6780656864/reviews.md

## What is Rounding Unlocked?

Rounding Unlocked teaches kids how to round numbers the right way — through understanding, not just memorization.
Built by a real educator with 20+ years of experience teaching in Philadelphia classrooms, this app takes children through 6 carefully sequenced worlds that build rounding fluency from the ground up.
What your child will learn:

World 1: What is Rounding? — number lines and the mountain rule
World 2: Rounding to the Nearest 10 — two-digit numbers
World 3: Rounding to the Nearest 100 — three-digit numbers
World 4: Rounding to the Nearest 1,000 — four-digit numbers
World 5: Rounding Decimals — to the nearest whole number
World 6: Estimating with Rounding — real-world problem solving

Features:

Interactive tips that teach the concept before practice begins
Visual number lines, mountain diagrams, and place value spotlights
10-question practice and quiz for every world
Rounding Master Challenge — 40 questions across all 6 worlds
Audio narration for every tip — perfect for struggling readers
Worlds 1 and 2 are completely free

Rounding is one of the most important foundational math skills. Unlock it today.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All Worlds | $2.99 | one-time |



## Version history (last 2 releases)

### 1.0.1 — 2026-07-10

Improved user experience.

### 1.0 — 2026-06-19

No release notes.

## More apps by One On One Tutoring Service

- [Multiplication Unlocked](https://appshunter.io/ios/app/multiplication-unlocked/id6760908927)
- [Place Value Unlocked](https://appshunter.io/ios/app/place-value-unlocked/id6770703795)

All apps by One On One Tutoring Service: https://appshunter.io/developer/1886746583

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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 2026-07-18.*