# Rocket 123s

> Number Skills for Ages 3-7

Canonical page: [https://chrome-stats.com/d/id1304335839](https://chrome-stats.com/d/id1304335839)

## Overview

- **ID:** `id1304335839`
- **Platform:** Apple
- **Type:** Apple app
- **Status:** Available
- **Publisher:** Donalee Markus
- **Category:** Family
- **Rating:** 5.00 / 5 (2 ratings)
- **Version:** 2.1
- **Last updated:** 2026-05-11
- **First published:** 2018-03-03
- **Size:** 166 MB
- **Data as of:** 2026-09-05
- **Store listing:** [Apple App Store](https://apps.apple.com/us/app/rocket-123s/id1304335839)
- **Website:** [http://designsforstrongminds.com](http://designsforstrongminds.com/)
- **Privacy policy:** [http://designsforstrongminds.com/privacy-policy.php](http://designsforstrongminds.com/privacy-policy.php)

## Description

Number recognition and form constancy for ages 3–7. Hierarchical exercises from a Northwestern Ph.D. with 40 years of clinical practice with children.

A clinical-grade learning app that helps children ages 3–7 recognize, sort, and develop foundational understanding of numbers — designed by Dr. Donalee Markus, a Northwestern-trained neuroscientist with 40 years of practice working with children.

WHAT IT TEACHES

• Number recognition (1–10 and beyond)

• Form constancy — recognizing the same number across fonts and styles

• Number sorting and basic sequencing

• Foundations of mathematical reasoning

• Visual processing of numerical symbols

WHO IT'S FOR

• Children ages 3–7

• Pre-K and kindergarten learners

• Children with learning differences who benefit from explicit practice

• Children with delayed math readiness

• Used by parents, teachers, and clinicians

WHAT MAKES IT DIFFERENT

Rocket 123s is built on the same three-pillar neurocognitive model that Dr. Markus uses with adult patients — Attention, Intention, Rehearsal. The exercises are hierarchical and progressive, designed to build genuine skill rather than just keep a child engaged.

ABOUT THE DEVELOPER

Dr. Donalee Markus has practiced cognitive restructuring since 1983, including extensive work with children. She earned her Ph.D. at Northwestern University and completed post-doctoral training under Reuven Feuerstein.

## Rankings

- #636,889 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/id1304335839)